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Preheat the oven to 350°F (175°C). Grease a 9-inch round cake pan or an 8×8-inch square baking dish with butter.
In a small saucepan, melt the butter over medium heat, then add the brown sugar and stir until the sugar melts and a smooth sauce forms, about 2-3 minutes.
Pour the caramel sauce evenly into the bottom of the prepared cake pan.
Arrange the banana slices over the caramel in a single layer, covering the entire bottom.
Make the cake batter:
In a medium bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
In a separate bowl, whisk together the egg, milk, melted butter (or oil), and vanilla extract until well combined.
Pour the wet ingredients over the dry ingredients and stir until well combined. Be careful not to overmix, as this can make the cake tough.
Assembling the Cake:
Pour the cake batter over the banana slices and caramel in the pan, spreading evenly with a spatula.
How to Bake:
Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center of the cake comes out clean.
Leave the cake to cool in the pan for 5-10 minutes before inverting onto a serving plate. Run a knife around the edges of the cake to help loosen it from the pan.
Serve the Banana Upside Down Cake warm, either on its own or with a scoop of vanilla ice cream or a teaspoon of whipped cream.
For an extra touch, sprinkle a little cinnamon or nutmeg into the batter before baking, or drizzle a little honey over the cake once it comes out of the oven. This super simple banana upside down cake is an easy dessert that will satisfy your sweet tooth with minimal effort!