In a bowl, combine peanut butter, sugar, brown sugar, flour, egg, baking soda, and vanilla extract. Mix until well combined and a soft dough forms. Set aside.
Prepare the Brownie Batter:
Preheat your oven to 350°F (175°C) and grease a 9×9-inch baking pan.
Prepare the brownie mix according to the package instructions.
Assemble the Layers:
Pour half of the brownie batter into the prepared baking pan, spreading it evenly.
Drop spoonfuls of the peanut butter cookie dough over the brownie layer. Gently press down to create an even layer of cookie dough.
Pour the remaining brownie batter over the peanut butter cookie layer and spread evenly to cover.
Bake:
Bake for 30-35 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs (avoid overbaking for fudgier brownies).
Let the brownies cool completely in the pan before cutting.
Serve:
Slice into squares and enjoy the rich, fudgy brownies with a creamy, peanut butter cookie center.
These Peanut Butter Cookie–Stuffed Brownies are gooey, decadent, and filled with delicious layers of chocolate and peanut butter. Perfect for any special occasion or simply when you need an indulgent treat! 💛
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