Mash liquid ingredients together. Pour melted butter into a large bowl. Add bananas and mash into a pulp with a potato masher. Add egg and beat until smooth.

Mix in remaining ingredients. Add sugar, ricotta, and vanilla and stir to incorporate. Add remaining ingredients and stir just until all flour is incorporated, don't overmix. The batter will be on the thick side. 

Bake. Scrape batter into prepared pan and place on the bottom rack of the oven. Bake until a toothpick inserted in the center comes out clean, 55-65 minutes.

Let cool. Remove to a cooling rack and let sit at least 20 minutes before removing from the pan.