These rich, chocolate-y brownies feature extra flavor and texture, thanks to a generous amount of peanut butter! Even better: they're gluten free and so easy to make with our Gluten Free Brownie Mix.
Preheat oven to 350°F. Spray a 9 x 9-inch pan with cooking spray and set aside.
Place Gluten Free Brownie Mix in a large bowl. Add butter, eggs and water, and mix with an electric mixer on medium speed until just combined.
Spread batter in prepared pan and set aside.
In a separate bowl, combine peanut butter, powdered sugar, melted butter, vanilla and salt (if needed) and mix well. Add chopped peanuts and mix to thoroughly combine.
Place large dollops of peanut butter mixture across the top of the brownie mixture. Run a butter knife through the peanut butter and brownie mixtures, turning and swirling to incorporate the mixtures and produce a decorative swirl pattern.
Bake at 350°F until a toothpick inserted in the center comes out clean, about 25 minutes. Let cool before portioning.
