Some desserts bring instant nostalgia—and these Peanut Butter Cookie Bars are one of them. They’re inspired by the comforting, no-fuss baking style of the classic lunch lady treats, but with a flavor upgrade that’s pure homemade goodness. One pan is all it takes to whip up this soft, chewy dessert that’s perfect for potlucks, bake sales, or weeknight indulgences.

If you’ve ever found yourself reaching for packaged cookies at the store, this recipe will change your dessert game. There’s something about the smell of freshly baked peanut butter cookies wafting through the kitchen that no store-bought snack can match. These bars deliver all that joy in an easy sheet pan format—no rolling, shaping, or endless baking batches required.

And let’s talk about the frosting. The rich, creamy peanut butter layer on top doesn’t just complement the cookie base—it completes it. Every bite is the perfect marriage of sweet and salty, soft and melt-in-your-mouth, making this a dessert that disappears fast at any gathering.

Why You’ll Love These Peanut Butter Cookie Bars

• Effortless Prep – Just mix, pour, and bake—perfect for busy weeknights or last-minute events.
• Feeds a Crowd – One large sheet pan makes plenty of servings for parties, holidays, or bake sales.
• Frosting Perfection – A silky peanut butter topping makes these extra indulgent.
• Versatile Flavor – Swap in chocolate frosting or add mix-ins for a custom twist.
• Family-Friendly Comfort Food – Loved by kids and adults alike.