Creating your Banana Upside Down Cake is straightforward when you follow these easy steps:

1. Preheat Oven: Set your oven to 350°F (175°C) and grease a 9-inch round cake pan.

2. Prepare Bananas: Slice the bananas into ¼-inch thick rounds and set them aside.

3. Make the Topping: In a bowl, mix the melted butter and brown sugar until well combined. Spread this mixture evenly in the bottom of the prepared cake pan. Arrange the banana slices on top in an even layer.

4. Mix Wet Ingredients: In a separate bowl, whisk together the granulated sugar and eggs until light and fluffy. Stir in the vanilla extract and buttermilk until combined.

5. Combine Dry Ingredients: In another bowl, combine the all-purpose flour, baking powder, baking soda, and salt.

6. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Do not overmix.

7. Pour Batter: Carefully pour the cake batter over the arranged bananas in the cake pan. Level the batter with a spatula.

8. Bake: Place in the preheated oven and bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean.

9. Cool: Once baked, remove the cake from the oven and let it cool in the pan for about 15-20 minutes.

10. Invert the Cake: Carefully run a knife around the edges of the cake to loosen it. Invert the cake onto a serving plate so the bananas are on top.