Rating: 5.00
(9)

One-Bowl Peanut Butter Chocolate Chip Oatmeal Blondies

By Rachel
May 14, 2022

These peanut butter chocolate chip oatmeal blondies are thick, chewy, and loaded with rich milk chocolate. Peanut butter cookie dough with chocolate, oats, and topped with sea salt. This dough requires no chill time and the bars bake up in less than 30 minutes. Perfect for birthdays or gatherings! Cut these up into bite sized pieces or decorate and serve as a cookie cake type dessert.

Highlights of these cookie bars:

  • Chewy texture
  • Studded with chocolate chips
  • Center stays gooey while outsides get slightly crisp
  • Family friendly
  • Great for crowds
  • Same classic cookie recipe, but easier!
  • Simple ingredients
  • Right amount of sweetness
  • Uses melted butter not softened butter, so mixing is easier

Tips for successful oat bars:

  • Don’t overmix ingredients, only mix until incorporated.
  • Grease AND line your baking pan. I like to grease the bottom and corners really well and over line with a piece of parchment paper so I can easily lift out my bars.
  • Allow bars to cool completely, this helps so they don’t fall apart! Let them cool if you want nice even bars.

If you like these One-Bowl Peanut Butter Chocolate Chip Oatmeal Blondies, you’ll love…

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First Steps:

  • Combine peanut butter and melted butter
  • Add in sugars
  • Mix in eggs and vanilla
  • Add in dry ingredients

Tools I used for this easy recipe:

  • USA Pan 9×13 inch Baking Pan – another USA Pan product I love! The corners of my bars and cakes never stick and I love the squared of edges this pan creates.
  • Rubber Spatula – a must for any home baker! Perfect for scrapping cookie dough out of the mixing bowl.
  • Pyrex Mixing Bowl Set – I love this set of nesting bowls, perfect for home baking!

Grocery List & Substitutions:

  • All-purpose flour
  • Baking powder
  • Salt
  • Unsalted butter, melted
  • Creamy peanut butter
  • Granulated white sugar
  • Light brown sugar
  • Large eggs
  • Vanilla extract
  • Old fashioned rolled oats
  • Chocolate chips or chocolate chunks
  • Sea salt

Second Steps:

  • Fold in oats and chocolate
  • Grease and line baking dish
  • Transfer dough into dish and press down
  • Top with extra chocolate
  • Bake and enjoy

Instructions for the blondies:

  • Preheat oven to 350 degrees F. Grease or line an 9×13″ baking pan, set aside. In a small mixing bowl combine the flour, baking powder, and salt, stir to combine and set aside.
  • In a large mixing bowl, combine the melted butter and peanut butter, mix until combined. Add in the sugars and mix for an additional 1-2 minutes. Add in the eggs, one at a time and the vanilla.
  • Slowly add in the dry ingredients and mix until combined. Fold in the chocolate and oats, transfer into the prepared baking pan. If desired, top with extra chocolate chips.
  • Bake at 350 degrees for 22-25 minutes or until a toothpick inserted comes out clean. Remove form the oven and let cool on a wire rack, sprinkle with flaky salt and allow to cool before cutting.

Peanut Butter Chocolate Chip Oatmeal Blondies

5 from 9 votes
Soft & chewy blondies loaded with peanut butter, oats, and chocolate chunks
Servings 24 Servings
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes

Equipment

  • 9×13" Baking pan

Ingredients
 
 

  • 1 3/4 cups All-purpose flour
  • 1 tsp Baking powder
  • ½ tsp Salt
  • 1/2 cup Unsalted butter, melted
  • 3/4 cup Creamy peanut butter
  • 1 cup Light brown sugar, packed
  • 1 cup Granulated white sugar
  • 2 Eggs, room temperature
  • 1 tbsp Vanilla extract
  • 12 oz. Semi sweet chocolate chips
  • 1 cup Old fashioned oats
  • Flaky sea salt, for garnish

Instructions
 

  • Preheat oven to 350 degrees F. Grease or line an 9×13" baking pan, set aside. In a small mixing bowl combine the flour, baking powder, and salt, stir to combine and set aside.
  • In a large mixing bowl, combine the melted butter and peanut butter, mix until combined. Add in the sugars and mix for an additional 1-2 minutes. Add in the eggs, one at a time and the vanilla.
  • Slowly add in the dry ingredients and mix until combined. Fold in the chocolate and oats, transfer into the prepared baking pan. If desired, top with extra chocolate chips.
  • Bake at 350 degrees for 22-25 minutes or until a toothpick inserted comes out clean. Remove form the oven and let cool on a wire rack, sprinkle with flaky salt and allow to cool before cutting.

Nutrition

Serving: 1barCalories: 284kcalCarbohydrates: 36gProtein: 5gFat: 14gSaturated Fat: 7gPolyunsaturated Fat: 1gMonounsaturated Fat: 5gTrans Fat: 0.2gCholesterol: 25mgSodium: 111mgPotassium: 167mgFiber: 2gSugar: 23gVitamin A: 145IUCalcium: 37mgIron: 2mg
Author: The Hearty Life
Calories: 284kcal
Cost: $
Course: Dessert
Keyword: Blondies, Chocolate, Cookie Bars, Oatmeal, Peanut Butter

Did you make this recipe?

Please let me know how it turned out for you! Leave a comment below and tag @theheartylife on Instagram and hashtag it #theheartylife.

Did you make this recipe?

I would love to see it! Take a picture and post to Instagram with the tag @theheartylife and the hashtag #theheartylife – You can also leave me a question or comment below! If you’ve tried this recipe, feel free to give it a star rating on the recipe above.

Join the Conversation

  1. They look tasty!

  2. Lu Lorenzen says:

    5 stars
    These one bowl peanut butter chocolate Chip oatmeal blondies are delicious. I was asked for recipe instantly. The explanation of making was super helpful and described well. Making soon for quilt group.

    1. Rachel Author says:

      Thank you so much!!

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