A plate full of the world's BEST peanut butter bars. Thick and chewy, with layers of smooth peanut butter and chocolate frosting.
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4.7 from 66 votes

World's Best Peanut Butter Bars

Perfectly thick, soft and chewy peanut butter bars with a peanut butter and chocolate glaze, and oats baked in the chewy cookie bars.
Prep Time15 mins
Cook Time20 mins
Total Time35 mins
Course: Dessert
Cuisine: American
Servings: 28
Calories: 202kcal
Author: Lauren Allen


For the bars:

  • 3/4 cup butter
  • 1/2 cup granulated sugar
  • 1 cup light brown sugar
  • 2 large eggs
  • 1/2 teaspoon vanilla extract
  • 1/2 cup creamy peanut butter (plus more for spreading over baked bars)
  • 2 1/2 teaspoons baking soda
  • 1/2 teaspoon salt
  • 1 1/2 cups all-purpose flour
  • 2 cups old-fashioned rolled oats

For the chocolate frosting:

  • 1/4 cup butter
  • 1 Tablespoon unsweetened cocoa powder
  • 1 1/2 Tablespoons milk
  • 1 1/4 cups powdered sugar
  • 1 teaspoon vanilla extract


  • Preheat oven to 350 degrees F. In a large mixing bowl, cream together the butter, sugar and brown sugar. 
  • Add the eggs, vanilla, and peanut butter and mix well.
  • In a separate bowl mix together the dry ingredients. Add dry ingredients to creamy mixture. 
  • Press firmly into a greased 9x13'' pan. Bake at 350 degrees for 17-21 minutes. Do not over-bake! They will look just barely set in the center, and they will harden as they cool. Allow to cool completely.
  • Once cooled, spread a thin layer of peanut butter over the bars.

To make the chocolate frosting:

  • Add butter to a small skillet over medium heat. Once melted, stir in cocoa.
  • Remove from heat and add milk, powdered sugar and vanilla. Whisk until smooth, using electric beaters to get out any lumps, if needed. .
  • Spread chocolate frosting over the top of the bars.



Calories: 202kcal | Carbohydrates: 26g | Protein: 3g | Fat: 9g | Saturated Fat: 4g | Cholesterol: 29mg | Sodium: 216mg | Potassium: 76mg | Fiber: 1g | Sugar: 17g | Vitamin A: 220IU | Calcium: 17mg | Iron: 0.8mg