01 -
Preheat oven to 350°F. Spray a 9-inch high-sided round or springform pan with nonstick spray. In a medium bowl, whisk melted butter and brown sugar; spread evenly in bottom of prepared pan. Arrange banana slices in an even layer over the brown sugar mixture.
02 -
In a large bowl, whisk together all-purpose flour, baking powder, and salt. Set aside.
03 -
In another bowl, beat softened butter, granulated sugar, egg, and vanilla extract until thoroughly combined.
04 -
Add dry ingredients to the wet mixture and beat until combined; batter will appear crumbly. Gradually add milk and beat until fully incorporated.
05 -
Spoon batter over banana layer and gently spread using an offset spatula. Bake for 35-40 minutes, or until toothpick inserted in center comes out clean, and top is golden brown.
06 -
Remove from oven; allow cake to cool in pan for 10 minutes. Run a knife around edges to loosen, then invert onto a serving platter.
07 -
Let cool completely. Dust with powdered sugar and optionally serve with a dollop of Cool Whip.