Skip to Content

Blue Mirror Glaze Cake

Few things are more satisfying than covering a cake in mirror glaze. Watching it slowly run down the sides of the cake, covering every inch of buttercream is so captivating. I’ve made a few mirror glaze cakes in the past, but this summer I wanted to make an ocean-inspired blue mirror glaze cake.

With the help of a few different shades of blue and a bright mirror glaze, this cake gives off total beach vibes!!

image of an ocean inspired white and blue mirror glaze cake

What Is Mirror Glaze?

At the base of every mirror glaze recipe, sugar and gelatin are the key ingredients.

Most recipes heat the mixture to allow the gelatin to dissolve and combine with the other ingredients. The glaze is then allowed to cool a bit before being poured over a chilled cake.

A lot of what gives the mirror glaze its shine is it being poured at the right temperature. I find that pouring my mirror glaze recipe at about 95 degrees F is the sweet spot.

At this temperature the glaze is thin enough to be easily poured over the cake, but thick enough to set on the cake and keep it’s vibrant color.

image of blue mirror glaze being poured over a chilled buttercream cake

What Does this Blue Mirror Glaze Taste Like?

My mirror glaze recipe includes a couple different ingredients that make it unique and (in my opinion) make it taste better than some classic mirror glaze recipes.

The biggest difference? White chocolate. I don’t know if you’ve ever tasted plain gelatin (or even smelled it), but it is simply disgusting.

Every time I mix plain gelatin with water to allow it bloom, my gag reflex kicks in.

With that being said, I wanted to add something to this recipe to cover that flavor. That’s where the white chocolate and sweetened condensed milk come in.

These are the primary flavors of this mirror glaze, and they give the glaze a sweet, subtle taste that pairs well with vanilla buttercream.

image of melted white chocolate being poured into melted gelatin to make an easy mirror glaze recipe

By adding in both of these ingredients, you’re also giving the glaze a whitish base, which makes it easier to color.

These ingredients also make the mirror glaze a tiny bit thicker, and more forgiving. It covers the cake in a thicker layer of glaze that a traditional mirror glaze.

How Much Mirror Glaze Does One Batch Make?

This recipe makes enough glaze to cover one, eight-inch layer cake.

While this technique is beautiful to make, it involves pouring tons of glaze over the cake. This is necessary to make sure the cake is fully covered in glaze.

You can try to salvage the glaze that runs off, but it can be more difficult to reuse once the colors combine. 

I rarely reuse mirror glaze once its been poured, but you can refrigerate leftover glaze in an airtight container and reheat it to use it again.

How to Color this Blue Mirror Glaze

While this blue mirror glaze cake is ocean-themed, you can create so many different looks with different colors.

When creating different colors of glaze, it’s super important that you use gel food coloring to color this glaze. I used navy, royal blue, and sky blue gel food coloring to make the different colored glazes poured over this cake.

image of three shades of blue mirror glaze ready to be used to make an ocean themed cake

Gel food coloring creates vibrant shades, because it is a lot more concentrated than liquid food coloring. This also means you don’t have to use much to get the color you’re after.

If you try to use liquid food coloring, you will have to use a ton to get bright colors, and this can throw off the consistency of the glaze.

To make the bright white mirror glaze I used a tiny bit of titanium dioxide!! its name makes it sound a bit intimidating, but it’s really just a vegan whitening agent.

image of a bright white mirror glaze made with titanium dioxide

You can also use white gel food coloring, but it won’t give you quite as bright of white color.

The Best Way to Pour Mirror Glaze Over a Chilled Cake

Now that we’ve covered everything you need to know about mirror glaze, let’s talk about actually pouring the mirror glaze onto a cake!

Once you’ve frosted and chilled your buttercream cake, remove it from the fridge or freezer and place the cake on a circular object on top of a large, rimmed baking sheet to catch the run-off glaze.

I like to rest the cake on a small cake pan or a wide, short glass.

image of an ocean inspired white and blue mirror glaze cake

Begin pouring the darkest glaze onto the center of the cake, then slowly work your way out to the edges. Once the cake is fully covered, drizzle the lighter colors over the cake to create a beautiful marbled look.

Let the glaze continue to drip for about 10 minutes, then use an offset spatula to scrape away any drips from the cake board.

The glaze should be mostly set. Place the cake in the fridge if you don’t plan to eat it within a few hours. 

image of a blue marbled mirror glaze cake that's been cut into

Additional Tips for Making the Best Mirror Glaze Cake:

  • This recipe can be used on any type of buttercream cake as long as it’s properly chilled.
  • If possible, make the cake on a cake board the same size as the cake layers to allow the glaze to drip directly off the bottom of the cake.
  • Don’t use this mirror glaze recipe on fondant! It can do weird things to the fondant, and create a goopy mess.
  • I prefer using mini white chocolate chips, but any white chocolate chip (or finely chopped white chocolate bar) will work.
  • You glaze should be thin enough to pour over over your cake, but thick enough that it is opaque and has a vibrant color. If you start to pour and it seems to thick or thin, adjust the temperature to get it to the consistency.
  • Do not use flavored jello in place of the unflavored gelatin in this recipe.
image of an ocean themed cake made with blue swirled cake layers and a pretty blue and white mirror glaze

Making This Cake in Advance & Storage Tips:

  • If you plan to eat the cake within a few hours after pouring the glaze, leave it out at room temp.
  • If you pour the glaze in advance, store the cake in the fridge. Remove the cake from the fridge a couple hours before you plan to cut into it.
  • Make this mirror glaze ahead of time or save leftovers! Once it’s made, wrap the bowl with plastic wrap store in the fridge for up to a week.
  • To use chilled glaze, heat the bowl in to the microwave for 15-20 second intervals until it reaches the right consistency
  • Use leftover glaze to top cupcakes, cookies, or even ice cream!

Other Recipes You Might Like:

Let Me Know What You Think!

If you try this blue mirror glaze recipe, I’d love to hear what think of it! Please leave a rating on the recipe card below.

Also be sure to tag me @chelsweets and use the hashtag #chelsweets, so I can see your beautiful creations on social media!

Yield: 24

Blue Mirror Glaze Recipe

image of an ocean inspired white and blue mirror glaze cake

Learn how to make this gorgeous, ocean-inspired blue mirror glaze cake! It's made with butter cake layers, smooth buttercream, and a white chocolate mirror glaze.

Prep Time 30 minutes
Cook Time 34 minutes
Additional Time 2 hours
Total Time 3 hours 4 minutes

Ingredients

Vanilla Cake Recipe

  • 3 cups all-purpose flour (390 grams)
  • 3 cups granulated sugar (600 grams)
  • 2 1/2 tsp baking powder (10 grams)
  • 1 tsp salt (6 grams)
  • 1 cup unsalted butter, room temperature (226 grams) - 2 sticks
  • 1 cup pasteurized egg whites from a carton (or about 7 egg whites) (235 grams)
  • 1 1/2 cups buttermilk or sour cream, room temperature (345 grams)
  • 2 Tbsp vegetable oil (28 grams)
  • 2 tsp vanilla extract (8 grams)
  • Blue gel food coloring (if desired)

Vanilla Buttercream Frosting

  • 2 cups unsalted butter, room temperature (454 grams)
  • 1 Tbsp vanilla extract or vanilla bean paste (12 grams)
  • 1 tsp salt (6 grams)
  • 7 cups powdered sugar (875 grams)
  • 1/4 cup heavy cream (or whipping cream) (60 grams)

Mirror Glaze Recipe

  • 2 1/2 tsp or 1 envelope of powdered unflavored gelatin (7 grams), bloomed in 1/4 cup of additional water
  • 1 1/2 cups granulated sugar (300 grams)
  • 3/4 cup water, room temp (180 grams)
  • 2/3 cup sweetened condensed milk (200 grams)
  • 1 2/3 cup white chocolate chips, melted (300 grams)
  • 1/2 tsp titanium dioxide or white gel food coloring
  • Blue gel food coloring

Additional Decorations – Optional

  • Graham cracker crumbs
  • White fondant
  • Small silicone seashell mold

Equipment Needed

Instructions

Vanilla Cake Layers:

  1. Preheat oven to 350°F. Line three 8" cake pans with parchment rounds and grease with non-stick baking spray.
  2. Mix together 3 cups all-purpose flour, 3 cups sugar, 2 1/2 tsp baking powder and 1 tsp salt in a stand mixer with a paddle attachment or hand mixer until fully combined.
  3. Mix in 1 cup of unsalted butter slowly into the dry ingredients on a low speed. Continue to mix until no large chunks of butter remain and the mixture looks crumbly.
  4. Pour in 1 cup of egg whites and mix on low until just incorporated. Mix in 1 1/2 cups buttermilk in two installments, on a low speed.
  5. Add in 2 Tbsp of vegetable oil and 2 tsp of vanilla extract and mix at a low speed until fully incorporated.
  6. If you plan to color your cake layers, add in the gel food coloring with the vanilla and oil.
  7. Scrape down the sides of the bowl with a rubber spatula, then beat on a low speed for about 30 seconds to make sure everything is properly mixed together.
  8. Divide the batter evenly between your prepared pans. Bake for 33-35 minutes or until a toothpick comes out with a few moist crumbs.
  9. Allow the pans to cool for 10 minutes, then run a small offset spatula around perimeter of the pan to separate the cake from the pan.
  10. Place cake layers into the freezer for 30 minutes to accelerate the cooling process. Once the layers are fully cooled, carefully flip the pans and remove the layers.
  11. Use a serrated knife to level the tops of the layers right before you plan to assemble your cake, or you can wrap and freeze them in you're making them in advance.
  12. If you make these cake layers in advance and freeze them, let them thaw for about 20 minutes before making your cake. The cake layers should still be slightly cold to the touch, which will make it easier to assemble your cake.

Vanilla Buttercream Frosting:

  1. While the cake layers bake and cool, make the vanilla buttercream frosting.
  2. Beat 2 cups of unsalted butter on a medium speed for 30 seconds with a paddle attachment, until smooth.
  3. Mix in 1 Tbsp of vanilla extract or vanilla bean paste and 1 tsp salt on a low speed.
  4. Slowly add in 7 cups of powdered sugar, 1 cup at a time. Alternate with small splashes of 1/4 cup of heavy cream.
  5. Continue to mix on low speed for a few minutes, until the desired consistency is reached. 
  6. If the frosting is too thick, add in additional cream (1 TBSP at a time). If the frosting is too thin, add in more powdered sugar (quarter of a cup at a time).
  7. Cover the buttercream with plastic wrap once it’s ready to
    prevent crusting.

Assembling the Cake:

  1. Stack and frost cake layers on a greaseproof cake board the same size as the cake layers.
  2. Add an even layer of buttercream between each cake layer with a large offset spatula.
  3. Add a thin coat of frosting around the cake, fully cover the cake layers.
  4. Smooth using a bench scraper, then chill the cake in the fridge
    (20 minutes) or freezer (5 minutes) until the frosting is firm to the touch.
  5. Add a second, thicker layer of frosting to the cake, and smooth using a bench scraper. Place the cake in the fridge (1 hour) or freezer (15 minutes) until the frosting is totally chilled.

Mirror Glaze:

  1. While the cake chills, make the mirror glaze. Pour 1 1/2 cups of granulated sugar, 3/4 cup of water, and 2/3 cup sweetened condensed milk in a heatproof bowl.
  2. Heat for 2 minutes on high power in the microwave. Remove the mixture and stir.
  3. Mix 1 envelope of about 2 1/2 tsp gelatin in a small bowl with 1/4 cup of water. Let this sit for a couple minutes until the gelatin is hydrated.
  4. Pour the bloomed gelatin into the sugar water and whisk until the gelatin is fully dissolved. 
  5. Melt 1 2/3 cup white chocolate in the microwave by heating in 30 second intervals, stirring between each interval. Once the white chocolate is fully melted, pour the chocolate into the warm gelatin mixture.
  6. Carefully whisk mixture until fully combined. Pour through a sieve to remove any chunks of un-melted chocolate or stubborn bits of gelatin, or blend with an immersion blender.
  7. Pour 50 grams of mirror glaze into a small bowl and mix in 1/2 tsp of titanium dioxide. Set aside.
  8. Divide the remaining glaze between three bowls – there should be about 350 grams per bowl. Color them different shades of blue using gel food coloring.
  9. Place a chilled buttercream cake on top of a circular object smaller than the cake board, and set this on top of large, rimmed baking sheet to catch the run-off glaze.
  10. Once the glaze has cooled to about 95 F /47 C it’s ready to be poured.
  11. Pour the darkest blue glaze onto the center of the cake, then slowly work out to the edges of the cake in a circular motion until the cake is covered. Alternate the shades of blue as you pour them to create an ocean-inspired look. Be sure to save a little bit of each color for the next step.
  12. Once the cake is fully covered, swipe a large offset spatula covered with the white mirror glaze across the top of the cake to create a marbled look, then drizzle with a bit of additional blue glaze.
  13. Let the glaze continue to drip for about 10 minutes then scrape away excess glaze from the bottom of the cake board using a small offset spatula. 
  14. Add crushed graham crackers around the base of the cake and garnish with small fondant seashells if desired.

Notes

One batch of this mirror glaze makes about 4 cups, which is more than enough glaze to cover one, eight inch layer cake.

If you plan to eat the cake within a few hours after pouring the glaze, leave it out at room temp.

If you pour the glaze in advance, store the cake in the fridge. Remove the cake from the fridge a couple hours before you plan to cut into it.

Make this mirror glaze ahead of time or save leftovers! Once it's made, wrap the bowl with plastic wrap store in the fridge for up to a week.

To use chilled glaze, heat the bowl in to the microwave for 15-20 second intervals until it reaches the right consistency

Use leftover glaze to top cupcakes, cookies, or even ice cream!

Nutrition Information

Yield

24

Serving Size

1

Amount Per Serving Calories 687Total Fat 31gSaturated Fat 18gTrans Fat 0gUnsaturated Fat 11gCholesterol 74mgSodium 339mgCarbohydrates 99gFiber 1gSugar 85gProtein 5g

Holly

Thursday 16th of September 2021

This is awesome as well as all of your posts I have viewed so far. I was wondering if you have any posts for image transfers to a cake n then decorating them?

CH

Sunday 15th of August 2021

Looks awesome! Is there anyway to make this dairy free?

Skip to Recipe