Ingredients

2 1/4 cups all purpose flour
2 tsp baking powder
1/2 tsp salt
2/3 cup brown sugar
6 tbsp butter, melted and cooled
1/2 cup crunchy peanut butter (or smooth)
2 large eggs
1 cup milk (low fat or skim is fine)
3/4 cup milk chocolate chips

Method

Preheat oven to 375F. Line a a standard 12-cup muffin tin with paper liners.
In a large bowl, whisk together flour, baking powder, salt and brown sugar.
In a medium bowl, whisk together the melted butter, peanut butter, eggs and milk until smooth. Pour into flour mixture and stir until just combined. Stir in chocolate chips. Batter will be thick.
Divide batter into your paper-lined muffin tin. Each cup should be filled to the top, not just half way up, to ensure you get a nice dome on the muffin.
Bake for 17-20 minutes, until a tester comes out clean and the top of the muffin springs back when lightly pressed.
Cool on a wire rack.