• Preheat the oven to 350 F. and lightly grease an 8 inch cake pan or an 8x8 inch square pan. Add a small precut piece of parchment to the bottom of the pan for easy release after cooling.
• In a large mixing bowl, mash the 4 ripe bananas (I like to use a potato masher but a fork works too). Stir on the sugar, egg, and melted butter.
• To the wet ingredients, add the flour, baking powder, baking soda, and salt. Fold everything together so it is just mixed. Do not over mix.
• Pour the batter into the greased prepared pan and set it aside.

Topping

• In a bowl, add the cold butter (cubed), flour, and brown sugar. Use a pastry blender or pastry cutter to create a crumble with the mixture until it looks like cornmeal.
• Pour the crumble mixture over the top of the batter and then sprinkle on the chocolate chips. Press them down just slightly.

Baking Instructions

• Place the coffee cake into the oven on the center rack and bake for 50-55 minutes or until the center comes out clean with a toothpick.
• Remove it from the oven and let it fully cool until the chocolate chips set and the pan is no longer warm.
• Flip the coffee cake out from the pan and onto the plate. Cut into 12 servings and enjoy.