The Best Peanut Butter Buttercream

Peanut butter is one of my favorite flavors. I add it to my oatmeal, my yogurt (Strange, I know! But I swear it’s delicious with honey!!), and I love baking with it! I’ve made several cakes with peanut butter in the past, including my next level honey roasted peanut butter cake, and my PB&J cake!!

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While I’ve used peanut butter buttercream on a lot of my cakes, I’ve never really shared my go to recipe! It’s really just adding some peanut butter to my classic american buttercream, but the peanut butter really thickens the frosting! I add in some additional heavy cream and egg whites as well, to make it more spreadable, and easier to frost with.

The Best Peanut Butter Frosting

This is my go to peanut butter buttercream recipe! It’s really just adding some peanut butter to my classic american buttercream, but the peanut butter really thickens the frosting! I add a touch more heavy cream and a tiny bit of egg whites to thin it out, and make it nice and smooth.

Prep Time 10 minutes


  • 1 1/2 cups unsalted butter (room temperature)
  • 1/2 cup creamy peanut butter
  • 8 cups powdered sugar
  • 1 tsp salt
  • 1/3 cup heavy cream
  • 1 tbsp pasteurized egg whites (room temperature)


  1. Beat the butter and peanut butter on a medium speed for 30 seconds with a paddle attachment, until smooth. 

  2. Slowly add in the powdered sugar, 1 cup at a time. Alternate with small splashes of cream. 

  3. Once fully mixed, add in the egg whites and salt, and beat on low until the ingredients are fully incorporated, and the desired consistency is reached. 

  4. If the frosting is too thick, add in additional cream (1 teaspoon at a time). If the frosting is too thin, add in more powdered sugar (quarter of a cup at a time).

Recipe Notes

If you are making frosting for a cake, it is important to mix the buttercream on low at the end of the process for a couple minutes, to get out any extra air that might have be incorporated during the mixing process. This will make it easier to get super smooth sides on your cake!

When using this to frost my go-to chocolate layer cake recipe (which can be used to make four 7 inch or 8 inch cake layers) I usually make 1.5 – 2 batches, depending on how I’m decorating the cake.

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I work in finance during day, and like to think of myself as a baker by night! Follow me here at, on instagram @chelsweets, and on YouTube ( ) to see my creations :D

4 thoughts on “The Best Peanut Butter Buttercream

  1. I’m curious why you need the egg whites. Won’t just adding the extra bit of heavy cream do the trick to help smooth the buttercream out??

    1. it just makes the buttercream a bit more silky! You can omit them if you don’t want to use them though

    1. Definitely! Once it’s frosted, the buttercream locks in the all the moisture and keeps the layers fresh. It can definitely be made a couple days in advance! The buttercream will crust, but that’s normal with american buttercream due to the high sugar content 🙂

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