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Ingredients

• For the cupcakes and cookie tops:
• 2 1/4 cups flour
• 1 1/4 cups granulated sugar
• 1/2 cup unsweetened cocoa powder
• 1 teaspoon baking soda
• 2 teaspoons cream of tartar
• 1 teaspoon salt
• 2/3 cup butter
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 cup milk
• For the filling:
• 1/2 cup unsalted butter at room temperature
• 1 1/2 cups marshmallow fluff
• 1 teaspoon vanilla extract

Description

Serious Eats