Add sliced bananas to the bottom of a bundt pan that has been liberally sprayed with nonstick cooking spray.
Top bananas with a combination of melted butter, brown sugar and cinnamon.
Add cake batter to the top of the caramel covered bananas.
Bake in a 350 degree oven for 35-40 minutes or until a toothpick comes out with only a few crumbs.
Remove from the oven and allow the cake to cool in the pan for 10 minutes before inverting the cake onto a cake plate.