Preheat your oven to 350°F (175°C).

Prepare your cake pans by greasing them with butter and dusting with flour.

Mix the dry ingredients in a bowl: flour, cocoa powder, baking powder, and salt.

Cream together the butter and sugar in a large mixing bowl until light and fluffy.

Add the eggs one at a time, mixing well after each addition.

Combine the dry ingredients with the wet mixture gradually, alternating with milk.

Pour the batter evenly into prepared pans and bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.

Cool the cakes in their pans for 10 minutes before transferring them to a wire rack.

In a bowl, beat together creamy peanut butter, powdered sugar, softened butter, and heavy cream until smooth.