4.29 from 56 votes
A plate full of the world's BEST peanut butter bars. Thick and chewy, with layers of smooth peanut butter and chocolate frosting.
World's Best Peanut Butter Bars
Prep Time
15 mins
Cook Time
20 mins
Total Time
35 mins

Perfectly thick, soft and chewy peanut butter bars with a peanut butter and chocolate glaze, and oats baked in the chewy cookie bars.

Course: Dessert
Cuisine: American
Unit: cup, large, Tablespoon, teaspoon
Servings: 28
Calories: 202 kcal
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)
  • 3/4 Tablespoon 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
  1. Preheat oven to 350 degrees F. In a large mixing bowl, cream together the butter, sugar and brown sugar. 

  2. Add the eggs, vanilla, and peanut butter and mix well.

  3. In a separate bowl mix together the dry ingredients. Add dry ingredients to creamy mixture. 

  4. 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.

  5. Once cooled, spread a thin layer of peanut butter over the bars.
To make the chocolate frosting:
  1. Combine the butter, cocoa and milk in a medium saucepan. Heat until boiling. 

  2. Stir for 2 minutes. Remove from heat and stir in confectioners sugar and vanilla.

  3. Spread chocolate frosting over the top of the bars. Chocolate will thicken once cooled.

Recipe Video

Nutrition Facts
World's Best Peanut Butter Bars
Amount Per Serving
Calories 202 Calories from Fat 81
% Daily Value*
Total Fat 9g 14%
Saturated Fat 4g 20%
Cholesterol 29mg 10%
Sodium 216mg 9%
Potassium 76mg 2%
Total Carbohydrates 26g 9%
Dietary Fiber 1g 4%
Sugars 17g
Protein 3g 6%
Vitamin A 4.4%
Calcium 1.7%
Iron 4.3%
* Percent Daily Values are based on a 2000 calorie diet.