- Cooking spray
- 1 3/4 cups all-purpose flour
- 1 1/4 cups packed light brown sugar
- 3/4 cup peanut butter
- 1/2 cup butter, softened
- 3 tablespoons milk
- 1 egg
- 1 tablespoon vanilla extract
- 3/4 teaspoon salt
- 3/4 teaspoon baking soda
- 1 (6 ounce) package chocolate chips (optional)
Preheat oven to 375 degrees F (190 degrees C). Spray the bottom and sides of a 9×13-inch baking dish with cooking spray.
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Mix flour, brown sugar, peanut butter, butter, milk, egg, vanilla extract, salt, and baking soda together in a bowl. Fold chocolate chips into the batter. Pour batter into the prepared baking dish.
Bake in the preheated oven until lightly browned and a toothpick inserted in the middle comes out clean, 20 minutes.