Transport yourself back to school days with these Classic Peanut Butter Lunch Lady Cookie Bars. Soft, chewy, and topped with a smooth peanut butter frosting, they’re perfect for bake sales, family gatherings, or after-school snacks. Easy to make with simple pantry staples, these bars are sure to become a crowd favorite!
For the Cookie Bars:
1/2 cup unsalted butter, softened
1/2 cup creamy peanut butter
1 cup granulated sugar
1 cup light brown sugar, packed
2 large eggs
1 tsp vanilla extract
2 1/2 cups all-purpose flour
1 tsp baking soda
1/2 tsp salt
For the Frosting:
1/2 cup creamy peanut butter
1/4 cup unsalted butter, softened
3 tbsp milk
4 cups powdered sugar
1 tsp vanilla extract
Preheat and Prepare Pan: Preheat your oven to 350°F (175°C). Grease or line a 10x15-inch jelly roll pan with parchment paper.
Mix the Cookie Dough: In a large bowl, cream together softened butter, peanut butter, granulated sugar, and brown sugar until light and fluffy. Add eggs, one at a time, mixing well after each addition. Stir in vanilla extract.
Combine Dry Ingredients: In a separate bowl, whisk together flour, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Bake: Spread the dough evenly into the prepared pan. Bake for 18–22 minutes, or until the edges are golden and the center is set. Let the bars cool for 10–15 minutes.
Prepare the Frosting: In a medium bowl, whisk together melted butter and peanut butter until smooth. Add milk, powdered sugar, and vanilla extract. Beat until creamy, adjusting the milk for a spreadable consistency.
Frost and Cool: Spread the frosting over the warm bars for a glaze-like effect, or let them cool fully before frosting for a thicker layer. Allow bars to cool completely before cutting into squares.
For an extra touch, add 1 cup of mini chocolate chips to the batter before baking.
If you prefer a marbled effect, swirl melted chocolate over the peanut butter frosting.
Use crunchy peanut butter instead of creamy for added texture.
For a gluten-free option, substitute all-purpose flour with a 1:1 gluten-free flour blend.