Chocolate Whoopie Pie Cake – Eat More Chocolate Eat More Chocolate

Ingredients

• 3/4 cup (6 ounces) soft unsalted butter
• 1 + 3/4 cups (12 1/4 ounces) granulated sugar
• 1/2 teaspoon salt
• 2 cups (8 1/2 ounces) unbleached all-purpose flour
• 3/4 cup (2 ounces) Dutch-process cocoa (I like Saco)
• 2 teaspoons baking powder
• 4 large eggs
• 2 teaspoons vanilla extract
• 1 + 1/2 cups (12 ounces) milk or water
• 1 + 1/3 cups butter, softened
• 3 cups confectioners' sugar
• 1 teaspoon vanilla extract
• 2 cups marshmallow fluff (coat the cup with cooking spray or lightly with oil first)
• 1/4 cup whipping/heavy cream
• 1/3 cup semisweet chocolate pieces
• rainbow jimmies