Peanut Butter and chocolate is one of the best flavor combinations out there! Our super easy Chocolate Peanut Butter No Bake Cookies is our favorite way to enjoy chocolate & peanut butter without switching on the oven, and our Ultimate Butterfinger Brownies are the best, decadent indulgence! We LOVE chocolate at our house. It’s just one of those things we can’t get enough of! Add some peanut butter and, oh my, we have definitely reached the next level of sweet perfection! These Peanut Butter Swirl Brownies are incredibly decadent and worth every single bite. I started off with my Homemade Brownie Recipe (it’s seriously the best!) and then swirled in a modified version of my Old-Fashioned Easy Peanut Butter Fudge resulting in the fudgiest, gooey Peanut Butter Swirl Brownies you can dream of! These delicious peanut butter brownies are so easy to whip up and ready in less than an hour. They smell AMAZING when they’re baking and it’s so difficult to not just cut right into them when they’re fresh out of the oven. You can make them up to 4 or 5 days ahead of time (if you have that level of self-control!) making this Peanut Butter Swirl Brownie recipe perfect for a no-fuss dessert over the holidays, busy summers, for bake-offs or potlucks, or just anytime the craving strikes.

Ingredients for Peanut Butter Brownies

Chocolate: Two kinds of chocolate are in this Peanut Butter Brownie recipe: Bittersweet chocolate is melted into the batter, and I added cocoa powder as well to give the brownies an extra chocolatey boost! Sugar: We have 3 kinds of sugar in this recipe. Granulated sugar and brown sugar are both in the batter to add sweetness, keep the center gooey and the outside crisp. Powdered sugar is in our Peanut butter swirl as it’s easier to dissolve into the peanut butter than granulated sugar. Vanilla extract: My Homemade Vanilla Extract brings out the best warm, sweet flavors in these brownies. Peanut butter: Make sure to use creamy peanut butter like Skippy or Jif, and not natural peanut butter. The consistency just doesn’t do this recipe justice. Butter: Butter is mixed into both the brownie batter and the peanut butter swirl, keeping these Peanut Butter Swirl Brownies ultra-moist. Peanut butter cups: Any size will work because we’ll be chopping them up! Most of the peanut butter cups go into the batter but I like to reserve a handful to sprinkle on top.

How to Make the best Peanut Butter Swirl Brownies

  1. Add in flour, salt, and peanut butter cups. After that, sprinkle the flour and salt over the brownie batter and gently stir it in with a wooden spoon or spatula, and then stir in most of the chopped peanut butter cups.5. Make the Peanut Butter Swirl. In a separate bowl, make the peanut butter swirl by beating the melted butter, peanut butter, powdered sugar, and vanilla together until smooth.
  2. Assemble. Drop about 2/3 of the brownie batter into the prepared pan by the spoonful. Fill in gaps with spoonfuls of the peanut butter mixture. Drop remaining brownie batter on top, then swirl both together with a knife.
  3. Bake! Bake for 30 to 35 minutes, until a toothpick inserted into the center of the brownies, comes out mostly clean with only a few crumbs attached. Be sure not to overbake.
  4. Cool, serve, and store. Finally, cool the Peanut Butter Swirl Brownies completely before cutting them. Store in an airtight container for up to 5 days on the counter or in the fridge.

Can I use a different size of pan?

Yes! I prefer the 9×9″ pan for brownies in general as it bakes evenly and quickly, however, an 8×8″ baking pan would work as well, giving you thicker brownies. You’d need to bake them for 10-15 more minutes with this pan. Using a 9×13″ baking pan for Peanut Butter Swirl Brownies is also a good option! The brownies will be thinner and take 5-10 minutes less to cook.

How do I store Peanut Butter Swirl Brownies?

Store these delicious Peanut Butter Swirl Brownies in the fridge or on the counter in an airtight container for up to 5 days.

How long should I let brownies cool?

It’s difficult (the struggle is real!) but it’s best to let these Peanut Butter Swirl Brownies sit for about 30 minutes before cutting into them. But they cut better and actually have a more intense flavor when the brownies are allowed to cool before slicing into them.

What ingredient makes brownies fudgy?

The main reason these Peanut Butter Swirl Brownies are so fudgy is the butter! More fat content in a brownie means they will be softer and gooier, whereas cakey brownies have more flour in them.

More Brownie Recipes

How to Make German Chocolate Brownies Gooey Swirled Nutella Brownies Fudgy Frosted Chocolate Mint Brownies Easy Caramel Pecan Brownies

Caramel Cornflake Brownies

Frosted Brownies

Fudgy Oreo Brownies

Let me know what you thought with a comment and rating below. You can also take a picture and tag me on Instagram @houseofnasheats or share it on the Pinterest pin so I can see.

Peanut Butter Swirl Brownies - 95Peanut Butter Swirl Brownies - 48Peanut Butter Swirl Brownies - 83Peanut Butter Swirl Brownies - 72Peanut Butter Swirl Brownies - 1Peanut Butter Swirl Brownies - 66Peanut Butter Swirl Brownies - 3Peanut Butter Swirl Brownies - 32Peanut Butter Swirl Brownies - 31Peanut Butter Swirl Brownies - 91Peanut Butter Swirl Brownies - 91Peanut Butter Swirl Brownies - 96Peanut Butter Swirl Brownies - 52Peanut Butter Swirl Brownies - 30Peanut Butter Swirl Brownies - 96Peanut Butter Swirl Brownies - 57Peanut Butter Swirl Brownies - 23Peanut Butter Swirl Brownies - 64Peanut Butter Swirl Brownies - 59Peanut Butter Swirl Brownies - 42Peanut Butter Swirl Brownies - 43Peanut Butter Swirl Brownies - 82Peanut Butter Swirl Brownies - 51Peanut Butter Swirl Brownies - 99Peanut Butter Swirl Brownies - 28Peanut Butter Swirl Brownies - 90Peanut Butter Swirl Brownies - 11