Make the Peanut Butter Dough

• In a bowl, beat the peanut butter, butter, and brown sugar until light and fluffy.

• Beat in the egg and vanilla.

• In a separate bowl, whisk together the flour, baking soda, and salt.

• Gradually mix into the wet ingredients until just combined.

Make the Brownie Dough

• Whisk together the melted butter and white sugar.

• Beat in the cocoa powder until smooth, then add the egg and vanilla.

• Fold in the flour, baking powder, salt, and chocolate chips until no dry streaks remain.

Chill the Doughs

• Chill both doughs for 30 minutes.

Form the Cookies

• Scoop 1-2 tablespoon portions of each dough and place them side by side on a parchment-lined baking sheet.

• Use a toothpick or skewer to gently swirl the doughs together in a marble pattern.

Bake

• Preheat oven to 350°F (175°C).

• Bake for 9-11 minutes, until the tops are lightly crackly and the edges are just set. The centers will still be soft.

Cool and Serve

• Allow the cookies to cool on the baking sheet for 5-10 minutes before transferring them to a wire rack to cool completely. Enjoy!