Chocolate Swirl Coffee Cake

Ingredients

• 3 tablespoons firmly packed brown sugar
• 1 tablespoon unsweetened cocoa
• 1 tablespoon butter
• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 3/4 cup butter, softened
• 1 1/2 cups sugar
• 1 cup sour cream
• 1 teaspoon vanilla
• 2 eggs, beaten
• 1/2 cup semisweet chocolate mini chips