Peanut Butter Swirl Brownies

Desserts, Tailgating / Friday, September 3rd, 2010

In just a few hours, we’ll be kicking off Labor Day weekend.

I had a long list of things I wanted to get done, but that was so misguided. This is the last three-day weekend until Thanksgiving! Time to hang out with friends, fire up the grill, go to the lake, throw a tailgate party or have one last summer picnic. Or get sucked into a marathon of “Law and Order: Criminal Intent.” Don’t you judge me! Those L&O marathons are powerful.

I’m not sure what adventure this weekend will bring, but I know it will include a batch of Peanut Butter Swirl Brownies. You make a simple chocolate brownie batter and a peanut filling, layer the two in a baking pan, and swirl them with a butter knife. I should have taken a photo of the pretty swirly top,  but when the brownies were cool enough to slice and eat, I totally did.

Any weekend that starts with this rich, fudgy, peanut-buttery goodness is destined for greatness. And a very tall glass of milk.

Peanut Butter Swirl Brownies

Adapted from “Martha Stewart Living”(February 2004)

Makes 9 large or 16 small brownies

    Chocolate Batter: 

  • 8 tablespoons (1 stick) unsalted butter, cut into small pieces, plus more for pan
  • 2 ounces good-quality unsweetened chocolate, coarsely chopped
  • 4 ounces good-quality semisweet chocolate, coarsely chopped
  • 2/3 cup all-purpose flour
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon salt
  • 3/4 cup granulated sugar
  • 3 large eggs
  • 2 teaspoons pure vanilla extract
    Peanut Butter Filling: 

  • 4 tablespoons unsalted butter, melted
  • 1/2 cup confectioners’ sugar
  • 3/4 cup smooth peanut butter
  • 1/4 teaspoon salt
  • 1/2 teaspoon pure vanilla extract
  1. Preheat oven to 325 degrees. Butter an 8-inch square baking pan and line with parchment, allowing a 2-inch overhang. Butter lining (not overhang).
  2. For Chocolate Batter: Put butter and chocolates in a heatproof medium bowl set over a pan of simmering water; stir until melted. Let cool slightly. Whisk together flour, baking powder, and salt in a bowl.
  3. Whisk granulated sugar into chocolate mixture. Add eggs, and whisk until mixture is smooth. Stir in vanilla. Add flour mixture; stir until well incorporated.
  4. For Peanut Butter Filling: Stir together butter, confectioners’ sugar, peanut butter, salt, and vanilla in a bowl until smooth.
  5. Pour one-third of batter into prepared pan; spread evenly with a rubber spatula. Drop dollops of peanut butter filling (about 1 tablespoon each) on top of batter, spacing about 1 inch apart. Drizzle remaining batter on top, and gently spread to fill pan. Drop dollops of remaining filling on top. Gently swirl peanut butter filling into batter with a butter knife, running it through the layers three times lengthwise and three times crosswise.
  6. Bake until a cake tester inserted into brownies (avoid center and edges) comes out with a few crumbs but is not wet, about 40 minutes. Let cool slightly in pan, about 15 minutes. Lift out; let cool completely on a wire rack before cutting into squares. Brownies can be stored in an airtight container at room temperature up to 3 days.

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14 thoughts on “Peanut Butter Swirl Brownies

  1. This is just what I needed for the men in my life. Fortunately, peanut butter isn't my favorite baking ingredient– and that is a good thing. I'll eat one of these, and I'm sure they're terrific. As for my boys… they will go crazy over these! Off to bake these. Thanks!

  2. Hey, I just posted a kicked up brownie, while good they weren't homemade. I'm diggin yours especially along side that tall cold glass of milk.

  3. do you think it's alright to use crunchy peanut butter? it's all i have, and living in china, peanut butter is a tough commodity to come by.

  4. Was sucked into the Star Wars marathon on Spike. ;) I could have seriously used a PB brownie or twenty. I'm scrambling to finish my secondary applications for med school and I think these brownies will be the perfect energy booster. Or the perfect means of procrastination. Either way, the brownies win.

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