1 cup (1/2 of batch) Easy Marshmallow Buttercream (recipe below)
Fluffy Peanut Butter Frosting
½ cup (1 stick) unsalted butter, softened at room temperature
1¼ cup creamy peanut butter
½ cup powdered sugar
Easy Marshmallow Buttercream
¾ cup (1½ sticks) unsalted butter, softened
~7 ounces marshmallow fluff (amount in a small jar)
1½ cups powdered sugar
1 teaspoon vanilla extract
Instructions
Spread peanut butter frosting over entire cake
Drop spoonfuls of marshmallow buttercream over peanut butter frosting layer
Use the back of a knife to carefully swirl the marshmallow buttercream into the peanut butter frosting (any kind of marble effect will work!)
Cut and serve
Fluffy Peanut Butter Frosting
Beat butter until light and creamy; beat in peanut butter until creamy and smooth
Mix in confectioners’ sugar on low speed just until combined and then beat for a couple of minutes until light and fluffy
Easy Marshmallow Buttercream
Cream butter on high speed until light and fluffy
Add fluff and combine on high speed until smooth
Add sugar and mix on low speed until combined; increase speed to high
until light and fluffy
Mix in vanilla on high speed until combined
Notes
The frostings really speak for themselves here, so I won't tell if you use your favorite chocolate cake mix If you want it to be even more peanut buttery, use the Reese's Pieces Cake Bars recipe with the Easy Marshmallow Buttercream shown here
Recipe by Keep It Sweet Desserts at http://www.keepitsweetdesserts.com/fluffernutter-chocolate-cake/