Preheat the oven to 350 F/ 175 C. Line and grease three, eight-inch cake pans, or four, seven-inch pans.
Combine 2 cups all-purpose flour, 2 cups sugar, 3/4 cup black cocoa powder, 2 tsp baking powder, 1 1/2 tsp baking soda, and 1 tsp salt in a large bowl. Whisk together until combined.
Add 1 cup of hot water and 2 tsp instant espresso or coffee in a separate, medium-sized bowl. Stir until dissolved.
Add 1 cup buttermilk, 1/2 cup oil, 2 eggs, and 2 tsp vanilla extract to the instant espresso mixture. Give the mixture a quick stir to combine the ingredients.
Pour the wet ingredients into the dry ingredients. Mix by hand until fully incorporated. The batter will be on the thin side, but that’s the consistency you're after!
Divide the batter evenly between the cake pans, and bake for about 24-27 minutes. I like to use a kitchen scale to weigh the pans. It makes sure each pan has the exact same amount of batter and helps the cake layers bake up to the same height.
Remove the cake layers from the oven and let them cool in the pans for about 10 minutes. Gently run an offset spatula around the rim of the cake pans to loosen them, then flip them into wire racks to finish cooling.
Once cooled, use a serrated knife to level the top of each cake layer. If you make these in advance, wrap and freeze them at this point.
Black Dark Chocolate Buttercream Frosting
Beat 2 cups of unsalted butter on a medium speed for 30 seconds with a paddle attachment until smooth.
Add 1 cup black cocoa powder, 1 tsp vanilla extract, and 1/2 tsp fine salt. Mix on low until the ingredients are fully incorporated.
Slowly mix in 5 cups of powdered sugar. Halfway through, add in 2/3 cup of heavy cream to make the frosting easier to mix.
Mix in 1 1/3 cups of melted and cooled dark chocolate on a low speed. I let the chocolate sit for about 10 minutes after melting it - it should still be completely liquid, but not hot to the touch. Mix until the ingredients are fully incorporated and the desired consistency is reached. Scrape the sides and bottom of the bowl with a rubber spatula as needed.
If you want the buttercream to be a darker shade of black, you can mix in a squirt of black gel food coloring. Then cover with plastic wrap to prevent crusting and set aside.
Assembling This Black Velvet Cake
Stack and frost cake layers on a greaseproof cake board, using a dab of frosting to help stick the first cake layer to the board.
Add an even layer of buttercream between each cake layer with a large offset spatula.
Then spread a thin coat of frosting around the cake, fully covering the cake layers. Smooth using a bench scraper, then chill the cake in the fridge (30 minutes) or freezer (10 minutes) until the frosting is firm to the touch.
Add a second, thicker layer of frosting to the cake and smooth using a bench scraper. Then decorate as desired and enjoy!
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Notes
Note: I updated this recipe in May 2022 to make the texture a bit more tender. If you want the original recipe, please email hello@chelsweets.com.
Tips for Making the Best Black Velvet Cake
Ingredients at room temp mix together better! Set out any cold ingredients ahead of time.
Properly measure your cake flour (spoon into the cup measure, then level). Or better yet, use a kitchen scale to measure your dry ingredients.
Mix your cake batter just until the ingredients are incorporated. This will ensure your cake layers are tender and fluffy.
Use a scale to weigh your cake pans as you fill them. Make sure each pan has the same amount of batter will make your cake layers bake to the same height and bake more evenly.
Bang your cake pans on the counter before putting it in the oven. This brings any air bubbles that are trapped in the batter to the surface.
Level your room temperature or thawed cake layers with a serrated knife to make them easier to stack.
Chill your cake layers in the freezer for about 20 minutes before assembling the cake and before adding the simple syrup. It makes it so much easier to stack and frost them!
Making this Black Velvet Cake in Advance and Storage Tips
I highly recommend making your cake layers in advance and freezing them. It breaks the process up and makes it more approachable.You can also make the chocolate frosting ahead of time or save any leftover frosting! It can be stored in an airtight container in the fridge for up to a month. This frosting can also be stored in the freezer for up to 3 months! Just be sure to give it a good stir once it thaws to make it nice and smooth again.A frosted cake can last in the fridge for a week, or in the freezer for a month. The buttercream locks in the moisture and keeps the cake fresh and delicious!