Recipe adapted from here
2 cups AP Flour
1 tsp baking powder
1 tsp baking soda
1/2 tsp salt
1 cup + 1/2 cup brown sugar, divided
2 sticks of butter, room temperature
1 tsp vanilla extract or 1 vanilla bean, scraped
1 cup of buttermilk*
3 very ripe bananas (one cut into 1/2 inch slices, the other two mushed in a bowl)
3 oz or 1/2 cup of dark chocolate chips or chopped dark chocolate (optional)
1/2 cup chopped walnuts or pecans (also optional)
1/2 cup powdered sugar
*or DIY buttermilk- 1 cup of milk mixed with 1 tablespoon of vinegar or lemon juice. Let it sit for 10 minutes until curdled.
Preheat the oven to 350 degrees. Spray or butter and flour your bundt pan. If you don't have one, you can use a 9 inch cake pan, just be extra careful to watch it as the baking time will be slightly off. Melt 1/2 of a stick of butter and pour into the bottom of the pan. Sprinkle 1/2 cup of brown sugar over it and place the sliced banana pieces on top, then sprinkle over pecans or walnuts if using. Set pan aside. Whisk together the flour, baking soda, baking powder and salt in a medium bowl and set aside. In a mixer bowl, beat together one stick of butter and the remaining cup of brown sugar for 3-4 minutes. Add in the vanilla then the eggs one at a time. Scrape down the sides of the bowl with a rubber spatula to make sure everything is getting mixed evenly. Mix in mashed bananas. Alternate between mixing in the flour mixture and the buttermilk one third each at a time, scraping the bottom and sides of the bowl as needed. Stir in the chocolate if using. Pour the batter into the pan and bake for about 40 minutes, until a cake tester comes out clean. Allow the cake to cool completely in the pan, then invert it onto a plate. Some banana pieces will likely have stuck to the pan, using a fork or spoon, gently lift them and transfer back onto the cake. Either top with powdered sugar or drizzle with glaze*.
*Brown Butter Glaze:
Melt the remaining 1/2 stick of butter in a small saucepan, stirring frequently over medium heat until the butter starts to turn brown and smell nutty. Remove from heat. Place the 1/2 cup of powdered sugar into a small bowl and whisk in the brown butter slowly. Sprinkle with salt, whisk until smooth.