Why I’ll Love This Recipe
I love how these bars combine the timeless flavors of chocolate and peanut butter in every bite. The cookie-like base stays soft and chewy, while the creamy peanut butter layer adds richness and the chocolate frosting creates the perfect finishing touch. I also appreciate that they’re easy to prepare in one pan, making them ideal for feeding a crowd or preparing ahead for special occasions.
Ingredients
(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)
Bars
- Salted butter
- Creamy peanut butter
- Light brown sugar
- Granulated sugar
- Large eggs
- Vanilla extract
- All-purpose flour
- Baking powder
- Kosher salt
Chocolate Frosting
- Salted butter
- Powdered sugar
- Unsweetened cocoa powder
- Vanilla extract
- Warm milk
Directions
- I preheat the oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper.
- I melt the butter with part of the peanut butter until smooth.
- I stir in the brown sugar, granulated sugar, eggs, and vanilla extract.
- I mix the flour, baking powder, and salt into the wet ingredients until a soft dough forms.
- I spread the dough evenly into the prepared baking pan.
- I bake for 18–22 minutes, or until the center is just set.
- I spread the remaining peanut butter over the warm bars and let them cool completely.
- I beat together the frosting ingredients until smooth and spread the chocolate frosting evenly over the cooled peanut butter layer.
- I allow the frosting to set before slicing the bars into squares and serving. (Half Baked Harvest)
Servings and Timing
- Servings: 24 bars
- Prep Time: 20 minutes
- Cook Time: 20 minutes
- Cooling Time: 1 hour
- Total Time: 1 hour 40 minutes (Half Baked Harvest)
Variations
- I use crunchy peanut butter when I want extra texture.
- I swap the chocolate frosting for chocolate ganache for an even richer dessert.
- I stir mini chocolate chips into the dough for extra chocolate flavor.
- I sprinkle chopped roasted peanuts over the frosting for added crunch.
- I substitute a gluten-free flour blend to make a gluten-free version.
Storage/Reheating
I keep the bars in an airtight container at room temperature for up to 4 days or in the refrigerator for up to 1 week. If I want to store them longer, I freeze individual bars for up to 3 months. I let frozen bars thaw in the refrigerator or at room temperature before serving. (Half Baked Harvest)
FAQs
Can I use natural peanut butter?
I prefer using regular creamy peanut butter because it creates a smoother texture and more consistent results.
Can I make these bars ahead of time?
Yes. I often prepare them a day in advance since the flavors become even better after resting overnight.
How do I know when the bars are done baking?
I remove them when the center is just set. Overbaking can make the bars dry.
Can I freeze these bars?
Yes. I wrap each bar individually and freeze them for up to 3 months for an easy make-ahead dessert.
Can I use milk chocolate frosting instead of cocoa frosting?
Absolutely. I sometimes use milk chocolate frosting or even chocolate ganache for a sweeter finish.
Conclusion
I always enjoy making these Lunchroom Chocolate Peanut Butter Bars because they’re easy, nostalgic, and packed with rich peanut butter and chocolate flavor. The soft cookie base, creamy peanut butter layer, and smooth chocolate frosting create a dessert that everyone looks forward to. Whether I’m sharing them with friends or saving a few for later, they’re always a guaranteed favorite.
PrintLunchroom Chocolate Peanut Butter Bars
These lunchroom chocolate peanut butter bars feature a soft, chewy peanut butter cookie base topped with a creamy peanut butter layer and rich chocolate frosting. They’re an easy, nostalgic dessert that’s perfect for parties, bake sales, or satisfying any chocolate-peanut butter craving.
- Prep Time: 20 minutes
- Cook Time: 20 minutes
- Total Time: 1 hour 40 minutes
- Yield: 24 bars
- Category: Dessert
- Method: Bake
- Cuisine: American
- Diet: Vegetarian
Ingredients
- Bars:
- 1 cup salted butter
- 1 1/2 cups creamy peanut butter, divided
- 1 cup light brown sugar
- 1/2 cup granulated sugar
- 2 large eggs
- 2 teaspoons vanilla extract
- 2 1/2 cups all-purpose flour
- 2 teaspoons baking powder
- 1/2 teaspoon kosher salt
- Chocolate Frosting:
- 1/2 cup salted butter, softened
- 3 cups powdered sugar
- 1/2 cup unsweetened cocoa powder
- 1 teaspoon vanilla extract
- 3 to 4 tablespoons warm milk
Instructions
- Preheat the oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper or lightly grease it.
- Melt the butter with half of the peanut butter until smooth, then let cool slightly.
- Stir the brown sugar, granulated sugar, eggs, and vanilla extract into the butter mixture until well combined.
- Mix in the flour, baking powder, and kosher salt until a soft dough forms.
- Spread the dough evenly into the prepared baking pan.
- Bake for 18 to 22 minutes, or until the center is just set and the edges are lightly golden.
- While the bars are still warm, spread the remaining peanut butter evenly over the surface. Let cool completely.
- For the frosting, beat together the butter, powdered sugar, cocoa powder, vanilla extract, and enough warm milk to create a smooth, spreadable consistency.
- Spread the chocolate frosting evenly over the peanut butter layer.
- Allow the frosting to set before slicing into 24 bars and serving.
Notes
- Regular creamy peanut butter provides the smoothest texture and most consistent results.
- Do not overbake the bars to keep the base soft and chewy.
- Top with chopped roasted peanuts or mini chocolate chips for added texture.
- Store in an airtight container at room temperature for up to 4 days or refrigerate for up to 1 week.
- Freeze individual bars for up to 3 months and thaw before serving.
Nutrition
- Serving Size: 1 bar
- Calories: 330 kcal
- Sugar: 25 g
- Sodium: 180 mg
- Fat: 19 g
- Saturated Fat: 8 g
- Unsaturated Fat: 9 g
- Trans Fat: 0 g
- Carbohydrates: 36 g
- Fiber: 2 g
- Protein: 6 g
- Cholesterol: 35 mg
