Whole Wheat Peanut Butter Muffins. (...with chocolate chips! of course.)

INGREDIENTS

2 cups

whole wheat pastry flour

1/2 tsp

baking soda

1/2 tsp

baking powder

1/4 tsp

salt

large egg

1/2 cup

plain Greek yogurt

1/3 cup

loosely packed brown sugar

1/2 cup

unsalted butter, melted and cooled

1/2 cup

peanut butter, melted and cooled

2/3 cup

milk

3/4 cup

chocolate chunks