Step 1: Cream Butter and Sugars

• In a large mixing bowl, beat the butter, granulated sugar, and brown sugar until light and fluffy.

• Add the egg and vanilla extract, then mix until well combined.

Step 2: Add Peanut Butter

• Stir in the peanut butter until smooth and fully incorporated into the batter.

Step 3: Mix the Dry Ingredients

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

• Gradually add the dry mixture to the wet mixture and mix until combined.

Step 4: Divide the Dough

• Divide the dough into two equal portions.

• In one portion, mix in the cocoa powder and chocolate chips to create the brownie dough.

Step 5: Swirl the Dough

• Take a small scoop of peanut butter dough and a small scoop of brownie dough.

• Gently press and twist them together to form a swirl without fully blending.

• Roll into a ball and place on a baking sheet lined with parchment paper.

• Repeat with the remaining dough.

Step 6: Bake the Cookies

• Preheat the oven to 350°F (175°C).

• Bake cookies for 9–11 minutes or until the edges are set but the centers remain soft.

• Optionally, press extra chocolate chips or chopped peanuts on top right after baking.

• Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.