Follow these simple steps to create the Decadent Banana Upside Down Cake with Caramel:

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

2. Prepare Caramel: In a saucepan over medium heat, melt the butter. Add the brown sugar and stir until combined. Cook for about 3-5 minutes until the mixture is smooth and bubbly. Pour the caramel into the prepared cake pan.

3. Arrange Bananas: Slice the bananas into rounds and arrange them over the caramel in the pan. Set aside.

4. Mix Dry Ingredients: In a bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.

5. Mix Wet Ingredients: In another bowl, beat the granulated sugar and eggs until light and fluffy. Add the milk and vanilla extract, mixing until smooth.

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

7. Pour Batter: Pour the batter over the banana and caramel layer in the pan, smoothing it out evenly. Bake for 35-40 minutes or until a toothpick inserted into the center comes out clean.

8. Cool: Once baked, allow the cake to cool in the pan for about 10 minutes. Then, carefully invert it onto a serving plate to reveal the beautiful banana topping.