Preheat your oven to 350°F (175°C).
Prepare the banana filling by slicing bananas and mixing them with sugar, vanilla, and lemon juice.
In a separate bowl, combine flour, baking powder, salt, and mix well.
In another bowl, mix melted butter and milk, then combine with dry ingredients to form a batter.
Pour the banana mixture into a greased baking dish, then spread the batter evenly on top.
Bake for 40-45 minutes or until the topping is golden brown.
Serve warm, optionally with ice cream or whipped cream.