Peanut Butter Chocolate Bars with Chocolate Frosting

These Peanut Butter Chocolate Bars with Chocolate Frosting start with a layer of super soft & chewy peanut butter cookie, then are topped with creamy milk chocolate frosting. So easy & perfect for peanut butter lovers!

Peanut Butter Chocolate Bars

Peanut Butter Chocolate Bars

Hi! My name’s Fiona and I’m so excited to meet you! I blog over at Just So Tasty, and today’s my first post on Lil’ Luna. I love baking desserts, and anything with peanut butter – especially peanut butter and chocolate. So, I thought it only made sense to share my favorite Peanut Butter Chocolate Bars. (Plus – one of my favorite recipes on Lil’ Luna is these Reese’s Pieces Peanut Butter Cookies.)

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Today’s peanut butter cookie bars start with a layer of soft and chewy peanut butter cookie. Then they’re frosted with creamy milk chocolate frosting, and decorated with Reese’s Pieces. The chocolate frosting makes them a little more special than regular peanut butter cookies. And because we’re making them in bar form, there’s less busy work since we don’t have to roll the dough into balls.

These Peanut Butter Cookie Bars with Chocolate Frosting start with a layer of super soft & chewy peanut butter cookie, then are topped with creamy milk chocolate frosting. So easy & perfect for peanut butter lovers!

Peanut Butter Cookie Bars

How to make Peanut Butter Cookie Bars

  1. Preheat the oven to 350. Line an 8×8 inch square baking pan with aluminum foil, then grease with non-stick cooking spray. Set aside.
  2. In a medium bowl using an electric mixer on medium speed, beat together the butter, sugar and peanut butter until smooth. Add in the egg and vanilla and continue beating until combined (about 30 seconds).
  3. Turn the mixer down to low speed and carefully beat in the flour, cornstarch and baking powder. You may need to turn off the mixer and scrape down the sides of the bowl.
  4. Spoon the batter into your prepared pan, and press down to the edges using your hands or a rubber spatula. Bake in your preheated oven for 20-23 minutes or until the top is set and the edges are just starting to brown and pull away from the sides of the pan. Allow to cool fully before frosting.
  5. To make the frosting, in a medium bowl using an electric mixer on medium speed beat the butter until softened. Turn the mixer down to low speed and beat in the confectioner’s sugar about 1/2 at a time. After each addition has been incorporated, turn the mixer up to medium high speed for 5 seconds. Then with the mixer on low speed, beat in the cocoa, vanilla and salt. Finally, beat in the whipping cream 1 tablespoon at a time until you get your desired consistency and sweetness level.
  6. To decorate the bars, first lift them out of the pan using the aluminum foil. Frost with the chocolate buttercream using a flat-edge knife. Then decorate with Reese’s Piece. Cut into 9-12 bars and serve.

PB Chocolate Bars

Chocolate Peanut Butter Bars

Favorite Chocolate Peanut Butter Bars

The layer of peanut butter cookie is soft and chewy making it my FAVORITE PB Bar. Having the butter softened makes it easier to mix everything together. The light brown sugar adds moisture, chewiness and extra flavor. The corn starch keeps them soft and tender!

The chocolate frosting is a simple recipe using butter, confectioner’s sugar, cocoa and whipping cream – plus a little vanilla and salt. I like to use whipping cream in frosting because it makes it extra creamy and smooth. But if you only have milk on hand, it’ll work too.

I love the combination of peanut butter and chocolate, so these bars are the perfect thing in my book. They’re a great way to dress up your peanut butter cookies. So pour yourself a cold glass of milk – because these chewy peanut butter cookie bars are sure to be a favorite of yours too!

For more chocolate + Peanut butter treats, check out:

Peanut Butter Cookie Bars Recipe

Delicious and chewy Peanut Butter Cookie Bars topped with an irresistible chocolate buttercream frosting and Reeses Pieces.

Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 12 bars
Calories 287 kcal
Author on lilluna.com

Ingredients

Peanut Butter Cookie Layer

  • 1/3 cup unsalted butter softened to room temperature
  • 2/3 cup light brown sugar packed
  • 1/3 cup peanut butter not natural or whipped
  • 1 1/2 tsp vanilla
  • 1 large egg
  • 1 cup all purpose flour
  • 2 tsp cornstarch
  • 1/2 tsp baking powder

Milk Chocolate Frosting

  • 1/3 cup unsalted butter softened to room temperature
  • 1 1/4 cup powdered sugar sifted
  • 3 tbsp natural cocoa powder sifted
  • 1 tsp vanilla
  • pinch salt
  • 2-3 tbsp whipping cream

Instructions

  1. Preheat the oven to 350F degrees. Line an 8x8 inch square baking pan with aluminium foil, then grease with non-stick cooking spray. Set aside.

  2. In a medium bowl using an electric mixer on medium speed, beat together the butter, sugar and peanut butter until smooth and no butter or sugar lumps remain. Add in the egg and vanilla and continue beating until combined (about 30 seconds).
  3. Turn the mixer down to low speed and carefully beat in the flour, cornstarch and baking powder. You may need to turn off the mixer and scrape down the sides of the bowl.
  4. Spoon the batter into your prepared pan, and press down to the edges using your hands or a rubber spatula. Bake in your preheated oven for 20-23 minutes or until the top is set and the edges are just starting to brown and pull away from the sides of the pan. Allow to cool fully before frosting.
  5. To make the frosting, in a medium bowl using an electric mixer on medium speed beat the butter until softened. Turn the mixer down to low speed and beat in the confectioner's sugar about ½ at a time. After each addition has been incorporated, turn the mixer up to medium high speed for 5 seconds. Then with the mixer on low speed, beat in the cocoa, vanilla and salt. Finally, beat in the whipping cream 1 tablespoon at a time until you get your desired consistency and sweetness level.
  6. To decorate the bars, first lift them out of the pan using the aluminium foil. Frost with the chocolate buttercream using a flat-edge knife. Then decorate with Reese's Piece. Cut into 9-12 bars and serve.

Recipe Notes

*Bars store well at room temperature in an air-tight container for up to 4 days.

 

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I’m thoroughly convinced that chocolate and peanut butter are the ultimate combo! These cookie bars look AMAZING! Thanks for sharing this recipe with us, Fiona. For more awesome recipes, visit her over at Just So Tasty!

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These Peanut Butter Cookie Bars with Chocolate Frosting start with a layer of super soft & chewy peanut butter cookie, then are topped with creamy milk chocolate frosting. So easy & perfect for peanut butter lovers!

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Author

Fiona Dowling

My name’s Fiona and I love to bake and blog. I share homemade, from scratch, classic recipes for desserts & sweet treats including cakes, cupcakes, cookies and more.

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Comments

  1. Wow. Just wow. So peanut butter-y. The perfect touch of chocolate. And heck, let’s just throw one of the world’s best candies right on top. I need these in my life right now!