• Preheat the oven to 350°F. Grease a 9x2-inch round cake pan.

Topping

• Combine brown sugar and butter in a bowl. Stir together and then pour into the round cake pan. Spread out evenly with a rubber spatula. Place banana slices directly on top of the butter and sugar mixture.

Cake

• In a separate mixing bowl, combine flour, baking soda, baking powder, a pinch of salt, and ground cinnamon. Whisk to combine.
• In another separate mixing bowl, add brown sugar, sugar, mashed banana, buttermilk, vanilla extract, oil, and eggs. Use a hand mixer to beat and combine.
• Add half of the dry ingredients to the wet ingredients and use a spoon to start incorporating. Add the remaining dry ingredients and completely incorporate until no white streaks of flour remain.
• Pour batter over the top of the sliced bananas. Spread evenly in the pan.
• Place in the oven and bake for 45 minutes. Check with a toothpick to make sure the cake is done in the middle and the toothpick is clean when checked. Cook for an additional 3 minutes, or until the toothpick comes clean.
• Let cool in the pan for 5 to 7 minutes. Place a large serving dish on the top of the pan and flip the cake over so that the bananas are on the top of the cake on the serving plate.
• Serve warm and enjoy!