To prepare a banana gingerbread with vanilla glaze, you'll first need to prepare your ingredients. Peel and slice your bananas. Place the banana slices in the bottom of an 8 x 8-inch baking pan. Add the flour, baking powder, sugar, vanilla, and salt. Pour the wet ingredients into the dry ingredients and mix until the ingredients are well combined. Bake the mixture for 20 to 25 minutes, or until it's just set. Remove the pan from the oven and allow it to cool for 10 minutes before serving.