Preheat waffle iron. Stir together flour, baking powder, salt, sugar, and nutmeg.
Beat egg yolks in another bowl with milk and vanilla. Stir in the flour mixture until blended. Stir in mashed bananas and butter.
Make waffles in waffle iron. Top with sliced bananas and maple syrup. Or melted chocolate. Or whipped cream. Or honey. Or hell, ice cream- whatever you want!