Creating Banana Upside Down Cake is a straightforward process if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Pan: Grease a 9×13-inch baking pan or a round cake pan. Set aside.
3. Melt Butter: In a small saucepan, melt the butter over medium heat. Once melted, pour it evenly into the prepared pan.
4. Add Brown Sugar: Sprinkle the brown sugar evenly over the melted butter, ensuring it’s well-distributed.
5. Slice Bananas: Peel and slice the bananas into 1/2-inch thick rounds. Arrange them in an even layer over the brown sugar.
6. Mix Dry Ingredients: In a bowl, whisk together the flour, baking soda, and salt. Set aside.
7. Mix Wet Ingredients: In another bowl, beat together the granulated sugar, eggs, buttermilk, and vanilla until smooth.
8. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until just combined.
9. Pour Batter: Carefully pour the batter over the arranged bananas in the pan, smoothing it out evenly.
10. Bake: Place in the preheated oven and bake for 40-45 minutes or until a toothpick inserted into the center comes out clean.
11. Cool the Cake: Remove from the oven and let it cool for 15-20 minutes. Do not rush this step!
12. Invert the Cake: Place a serving plate over the cake pan and carefully invert it. Gently lift the pan off to reveal the banana topping.

This simple process results in an incredible Banana Upside Down Cake that will surely impress everyone around the table.