Step 1

Preheat the oven to 350 degrees F (180 degrees C).

Step 2

Butter the sides of an 8-inch deep (preferably 2 inches tall) round cake pan. Set aside.

Step 3

In a bowl, mix Butter (1/4 cup), Brown Sugar (1/4 cup), and Rum (1 tablespoon) together. Pour the mixture into the bottom of the prepared cake pan.

Step 4

Arrange the Banana (in a single layer on the bottom of the pan.

Step 5

In a large bowl, add the Large Egg (2), Brown Sugar (4 tablespoon), Granulated Sugar (1/2 cup), and Vanilla Extract (1 teaspoon). Whisk until evenly combined.

Step 6

Add the slightly cooled Butter (6 tablespoon) and Sour Cream (1/2 cup) and whisk until the batter is smooth.

Step 7

In a medium bowl, combine the All-Purpose Flour (1 cup), Baking Powder (1 teaspoon), and Salt (1/4 teaspoon), mixing with a whisk, fork or sift all the ingredients together, until all the ingredients are evenly mixed.

Step 8

Pour the cake batter over the banana layer in the cake pan. Bake in the preheated oven for 35-40 minutes, until a toothpick inserted into the center of the cake comes out clean.

Step 9

Cool the cake in the cake pan for about 10 minutes. Loosen the cake from the cake pan by running a knife or a very thin spatula around the sides of the cake.

Step 10

Invert the cake onto your serving plate. Serve and enjoy!