Preheat your oven to 350°F (180°C) and grease a 9x9-inch baking pan.

In a large mixing bowl, whisk together the dry ingredients: flour, granulated sugar, baking soda, sea salt, and ground cinnamon.

In another bowl, mash ripe bananas, then mix in brown sugar, vegetable oil, vanilla extract, eggs, and sour cream.

Pour the banana mixture into the dry ingredients and fold in melted butter until just combined.

Transfer the batter to the prepared baking pan and bake for 25 to 35 minutes until golden and a toothpick comes out clean.

Let the cake cool in the pan for 10 minutes before turning it onto a cooling rack.

For the frosting, beat cream cheese and butter until smooth, then gradually add powdered sugar until fluffy.

Once the cake is completely cool, frost it evenly with the cream cheese frosting.