These peanut butter brownies are the ultimate treat. You’ll be amazed at how easy it is to make peanut butter brownies from a boxed mix!

Have you ever wondered “What can I add to a box of brownie mix?” Obviously, chocolate chips are an easy one, but what about making things a little fancier? I love the combination of chocolate and peanut butter so I started thinking about a peanut butter brownie. I decided to create a peanut butter swirl brownie using a box of brownie mix. It was so easy and so delicious!

The Best Brownie Mix for Peanut Butter Brownies

I recommend using Betty Crocker’s brownie mix but any 18.3oz box of mix should work just fine. If you have a smaller box of mix, such as a mix for an 8×8 pan, prepare it according to the package, add 1/3 cup of chocolate chips, and swirl in 1/3 cup of peanut butter on top.

How to Make Peanut Butter Brownies with a Boxed Mix

Combine the brownie mix, water, oil, eggs, and chocolate chips until combined.

Tips for Perfect Brownies

Be sure to spray your baking pan with non-stick spray, so that the brownies can come out of the pan easily.
Do not overbake the brownies. I recommend using an oven thermometer to ensure your oven doesn’t get too hot during the baking process.
Microwaving the peanut butter helps it spread more easily, especially if you’re using a thicker peanut butter.

Variations and Substitutions

I used dark chocolate chips but you could substitute white chocolate or semi-sweet chocolate chips if you prefer. You could even use peanut butter chips if you wanted an extra kick of peanut butter. I liked using creamy peanut butter but crunchy peanut butter works too. You could even use almond butter, for a different twist.

More Dessert Ideas

Looking for more dessert recipes? Try these Red Velvet Cake Cookies or these Carrot Cake Cookies! They’re made with boxed cake mix so they’re super quick and easy!