A cross between blondies and peanut butter cookies, these blondies are an easy treat that peanut butter lovers adore.
Preheat oven to 350 degrees F. Line a 9x13 inch baking dish with foil or spray with nonstick cooking spray.
Cream together the brown sugar, peanut butter, butter, and eggs until a thick paste forms. Use an electric mixer set to medium speed. Add the eggs, one at a time, until combined. Add the vanilla and mix for another minute.
Stop the mixer and add the gluten-free flour, baking powder, and salt. Turn mixer to low speed. Mix until combined. Batter will be thick. Stir in chocolate chips, if using.
Spread evenly into the prepared pan. Bake until set, about 35 minutes. Cool bars in the pan and then cut into squares.