1 1/2 cups all-purpose flour
1 tsp. vanilla extract
1 large egg, beaten
3/4 cup sugar (1/2 cup if you would like it less sweet, 1 cup if more sweet)
salt
1 tsp. baking soda
1/3 cup melted butter, unsalted or salted
3 very ripe bananas, peeled (about 1 1/4 to 1 1/2 cups mashed)