Ingredients

• ¾ cup butter, softened
• ½ cup white sugar
• ½ cup firmly packed brown sugar
• 1 egg
• 1 tsp vanilla extract, or more to taste
• 1 cup peanut butter
• 1 ¾ cups unbleached flour
• ¾ tsp baking soda
• 10 oz chocolate chunks

Directions

• Step 1
  Preheat oven to 375 degrees.

• Step 2
  Beat butter, white sugar, and brown sugar together with an electric mixer in a large bowl until light and fluffy. Beat egg and vanilla extract into the butter mixture. Add peanut butter and beat until incorporated.

• Step 3
  Sift flour and baking soda together in a separate bowl; mix into the butter mixture. Fold chocolate chunks into the mixture.

• Step 4
  Spread the batter into a 13×9-inch baking dish.

• Step 5
  Bake in the preheated oven until a toothpick inserted into the center comes out clean, 20 to 25 minutes. Cool completely before cutting into squares.