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5.0 from 6 votes

Flourless Peanut Butter-Chocolate Chip Oat Bars

An entire half sheet pan full of peanut butter-oat bars loaded with chocolate chips and topped with Reese's Pieces.

Prep Time
10 mins
Cook Time
10 mins
Total Time
30 mins
Servings: 36 bars
Calories: 289 kcal
Course: Snacks
Cuisine: American

Ingredients

  • ⅔ cup salted butter at room temperature
  • 2 cups light brown sugar
  • 1⅓ cups granulated sugar
  • 4 eggs
  • 1 teaspoon vanilla extract
  • 1½ teaspoons baking soda
  • 2 cups crunchy peanut butter creamy peanut butter is fine, too
  • 6 cups old-fashioned oats NOT quick-cooking oats
  • 1 cup semisweet chocolate chips
  • ½ cup Reese's Pieces

Instructions

    Cup of Yum
  1. Preheat oven to 350 degrees F. Lightly grease a 13x18-inch half sheet pan.
  2. With an electric mixer, beat the butter and both sugars together on medium speed until light and fluffy, about 3 minutes. Scrape down the sides of the bowl and add the eggs, one at a time, beating well after each addition. Add the vanilla extract and baking soda and beat to combine.
  3. Using a rubber spatula, stir in the peanut butter until completely combined, then stir in the oats, then the chocolate chips until all of the ingredients are fully mixed together.
  4. Turn the dough out onto the prepared baking sheet and, using your hands, press into an even layer (the dough may be slightly sticky, in which case you can dampen your hands to keep it from sticking). Sprinkle the Reese's Pieces on top and gently press into the dough.
  5. Bake until the bars are just lightly browned and no longer look wet on top, 15 to 17 minutes. Remove from the oven and allow to cool completely before cutting into bars. These can be stored in an airtight container, at room temperature, for up to 1 week.

Notes

  • Note: If you do not have a 13x18-inch pan and want to use a 9x13, cut all of the ingredients in half. You may need to start checking for doneness a few minutes early.
  • Note
  • Nutritional values are based on one serving

Nutrition Information

Calories 289kcal (14%) Carbohydrates 35g (12%) Protein 6g (12%) Fat 14g (22%) Saturated Fat 5g (25%) Cholesterol 27mg (9%) Sodium 158mg (7%) Potassium 203mg (6%) Fiber 2g (8%) Sugar 23g (46%) Vitamin A 135IU (3%) Calcium 32mg (3%) Iron 1.4mg (8%)

Nutrition Facts

Serving: 36bars

Amount Per Serving

Calories 289

% Daily Value*

Calories 289kcal 14%
Carbohydrates 35g 12%
Protein 6g 12%
Fat 14g 22%
Saturated Fat 5g 25%
Cholesterol 27mg 9%
Sodium 158mg 7%
Potassium 203mg 4%
Fiber 2g 8%
Sugar 23g 46%
Vitamin A 135IU 3%
Calcium 32mg 3%
Iron 1.4mg 8%

* Percent Daily Values are based on a 2,000 calorie diet.