Mix the flour, baking powder, sugar and salt in a bowl. Melt the butter briefly in the microwave and then place in a bowl with the peanut butter. Mix both with a whisk and then add the eggs and stir in. Pour in the milk and mix the flour and everything together.
It is a thick batter that is then baked in portions in the hot waffle iron.
You can serve the waffles with whipped cream and fruit, or just dust with powdered sugar.