1-First Step: Make the peanut butter filling Start by mixing 1/2 cup creamy peanut butter with 1/2 cup confectioners sugar in a medium bowl. Stir until the mixture becomes thick, smooth, and easy to scoop. This filling should feel soft but not sticky. If you want a nut-free version, sunflower seed butter or cookie butter can work in a similar way, though the flavor will change a bit. Once the filling is mixed, roll it into 24 small balls. Place them on a parchment-lined plate or baking sheet and freeze for at least 1 hour. Freezing is important because it keeps the filling firm while you wrap the dough around it later.

2-Second Step: Melt the chocolate Place the 8 ounces of coarsely chopped semi-sweet chocolate in a heat-safe bowl and melt it gently. You can use a microwave in short bursts or a double boiler. Stir until smooth, then set it aside so it can cool slightly. Using high-quality pure chocolate baking bars gives these brownie cookies a richer flavor, so this is one place where quality really matters.

3-Third Step: Mix the dry ingredients In a separate bowl, whisk together 3/4 cup all-purpose flour, 1/4 cup cocoa powder, 1 teaspoon espresso powder, 1 teaspoon baking powder, and 1/4 teaspoon salt. Whisking well helps distribute the leavening and cocoa evenly throughout the dough. This also keeps the finished peanut butter brownie swirl cookies from tasting uneven in any one bite.

4-Fourth Step: Cream the butter and sugars In a large mixing bowl, beat 5 tablespoons softened unsalted butter with 3/4 cup packed brown sugar and 1/4 cup granulated sugar until the mixture looks creamy and lighter in color. Add 2 large eggs, one at a time, then mix in 1 teaspoon pure vanilla extract. Room temperature eggs blend more smoothly, so the dough comes together better and bakes more evenly.

5-Fifth Step: Add the melted chocolate Mix the melted chocolate into the butter mixture. Stir until the batter is glossy and smooth. This is where the brownie cookie base starts to look rich and fudgy, which is exactly what you want for these peanut butter filled brownie cookies recipe-style treats.

6-Sixth Step: Combine the dry and wet mixtures Add the dry ingredients to the wet mixture and stir just until combined. The dough will be thick and a little sticky. Try not to overmix, because that can make the cookies tougher. If the dough feels too soft, that is normal at this stage.

7-Seventh Step: Chill the dough Cover the bowl and chill the dough for 1 hour. Chilling helps the dough become easier to shape and keeps the cookies from spreading too much in the oven. If you are short on time, you can chill a little longer, but the full hour gives the best results for peanut butter brownie swirl cookies.

8-Eighth Step: Shape the cookies Preheat the oven to 350 degrees Fahrenheit. Line baking sheets with parchment paper. Take the chilled peanut butter balls out of the freezer and work with a few at a time so they stay firm. Scoop a portion of brownie dough, flatten it slightly, place a frozen peanut butter ball in the center, then wrap the dough around it and seal the edges. Roll gently into a smooth ball. If you want a more marbled look, do not worry about making it perfect. A little unevenness gives the cookies a homemade style that looks charming once baked. Wash your hands frequently during shaping if the dough gets sticky, since that makes the process much easier.

9-Ninth Step: Bake the cookies Arrange the dough balls on the prepared baking sheets with a little space between each one. Bake at 350 degrees Fahrenheit for 12 to 13 minutes. The edges should look set, while the centers may still look slightly soft. That soft center is part of what makes these brownie cookies so good.

10-Tenth Step: Cool and finish Let the cookies cool on the baking sheet for 10 minutes before moving them to a wire rack. This resting time helps the cookies finish setting without falling apart. After that, transfer them carefully to the rack and let them cool completely, or enjoy one warm if you like a gooey center.