- 3/4 cup butter, softened
- 1/2 cup white sugar
- 1/2 cup firmly packed brown sugar
- 1 egg
- 1 teaspoon vanilla extract, or more to taste
- 1 cup peanut butter
- 1 3/4 cups unbleached flour
- 3/4 teaspoon baking soda
- 10 ounces chocolate chunks (such as Ghirardelli Bittersweet Chocolate)
Preheat oven to 375 degrees F (190 degrees C).
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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.
Sift flour and baking soda together in a separate bowl; mix into the butter mixture. Fold chocolate chunks into the mixture.
Spread the batter into a 13×9-inch baking dish.
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.