It’s just a mixture of peanut butter, powdered sugar, vanilla, and heavy whipping cream. Cupcake Ingredients. I liked the filling but the didn't have the best results with the cake. Insane Peanut Butter Cup Cake – a fudgy chocolate cake with creamy peanut butter filling and a rich chocolate frosting…then I topped it with tons of peanut butter cups and melted chocolate!This chocolate peanut butter cake recipe is so delicious, you’ll have your family begging for more! Peanut butter filling chocolate cupcake Moist rich chocolate cupcake with creamy smooth peanut buttercream filling. {YES, that was sarcastic.} Spoon two-thirds of the batter into the prepared ramekins, then spoon the peanut butter mixture on top. The peanut butter filling is super peanut buttery because I left out the butter. The BEST Peanut Butter Chocolate Cake Dessert Recipe I torted each of my cake layers to make a 4-layer cake. Cover with the remaining chocolate batter. #baking. So it’s healthy. Like the recipe 151 0 Ingredients. I've made it twice it may be me but it turned out dry both times and I didn't care for the flavor nor did my husband and chocolate & peanut butter …