Preparation Steps

• Preheat oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.
• In a large bowl, cream together the softened butter and granulated sugar until light and fluffy.
• Beat in the eggs one at a time, then stir in the vanilla extract and mashed bananas.
• In a separate bowl, whisk together the flour, cocoa powder, baking soda, and salt.
• Add the dry ingredients and sour cream alternately to the wet ingredients, beginning and ending with the dry ingredients. Mix until just combined.
• Gently fold in the chocolate chips.
• Pour the batter into the prepared cake pan and spread evenly.
• Bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean.
• Let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely.