Ingredients

• 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)

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Instructions

1. Preheat oven to 375 degrees F (190 degrees C).
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.
3. Sift flour and baking soda together in a separate bowl; mix into the butter mixture. Fold chocolate chunks into the mixture.
4. Spread the batter into a 13x9-inch baking dish.
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.