Follow this simple guide to bake your perfect Banana Upside Down Cake:

1. Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
2. In a small saucepan, melt the butter over low heat. Stir in the brown sugar and cook until smooth. Pour this mixture into the prepared cake pan.
3. Slice the bananas into rounds. Arrange the banana slices over the brown sugar mixture in the cake pan, covering it evenly.
4. In a mixing bowl, combine flour, baking soda, and salt. Whisk together until blended.
5. In another bowl, beat together the granulated sugar, egg, and vanilla until light and fluffy.
6. Add the buttermilk to the egg mixture and mix until well incorporated.
7. Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix.
8. Pour the batter gently over the bananas in the cake pan, spreading it evenly.
9. Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
10. Allow the cake to cool for about 10-15 minutes before inverting it onto a serving plate.

These steps guide you through creating an incredible Banana Upside Down Cake effortlessly!