Wednesday, September 25, 2019

Peanut Butter Bars with Oatmeal

Sometimes I just gotta have a peanut butter dessert. These delicious peanut butter bars with oatmeal are one of my favorites.

A soft pb cookie bar with an extra layer of peanut butter and slathered with chocolate frosting. You know you want some!

peanut butter bars

I recently made these for my son's football team. A couple of us were assigned to bring desserts. I brought two pans of these bars.

Let me tell you, they disappeared so quickly. There's just something about a homemade dessert that is WAY more appealing than store bought treats. They taste SO much better!

Peanut Butter Bars with Oatmeal

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peanut butter bars with oatmeal
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My mom always called these treats peanut butter brownies. I've also heard them referred to as peanut butter squares. Whatever you call them, they are yummy!

Try a butterfinger bar version by adding crushed butterfinger candy on top. It's so good!

You can throw together a batch of these fairly quickly. I like to make them earlier in the day and then frost them once they've cooled.

Ingredients needed for peanut butter squares:

  • peanut butter
  • butter
  • sugar
  • brown sugar
  • eggs
  • vanilla
  • baking soda
  • salt
  • flour
  • quick oats
  • chocolate frosting (not pictured)

ingredients needed for peanut butter bars

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How to Make Peanut Butter Bars

You will need a few basic cooking supplies:

how to make peanut butter bars
Let's get started.

cream butter, peanut butter and brown sugar

Begin with the butter, peanut butter and sugars. Mix together until smooth and creamy.

It's best if the butter is soft and spreadable. Let the butter sit out on the counter for an hour or so before starting.

add eggs and vanilla to batter

Add the eggs and vanilla and stir until combined.

adding flour to the peanut butter mixture

Add flour, baking soda and salt. I like to add all those dry ingredients into my little sifter and sift it all into the batter. It helps to disperse the baking soda and salt evenly throughout the whole mixture.

The flour sifter I have was passed down to me. I haven't seen this type available for sale. To use it, I fill with flour and then shake it into the bowl.

The sifters you can get now, generally have some kind of crank or squeeze handle that helps pass the flour through without having to shake it.

add oats to peanut butter mixture
Stir in the oats. I use quick oats for this recipe. Look at that dough. This is definitely a recipe where I lick the spoon! It's so good!

peanut butter bars - before and after baking

Spread batter into the bottom of a greased 9 X 13 pan. Bake at 350 for 20 minutes.

It will not seem quite done, the middle will still jiggle. This is what you want. If baked too long the peanut butter bars will be dry.

peanut butter bar toppings

Immediately place about 1/2 cup of peanut butter on the bars. Add it in small dabs and then place it back in the oven for 2 minutes to melt the peanut butter. 

Spread the melted peanut butter evenly over the bars. Cool completely before frosting with chocolate frosting. 

chocolate frosting on peanut butter squares

I have used store-bought frosting when in a rush.  But I prefer to make my own chocolate frosting.  (← See recipe) 

the best peanut butter bars recipe

More Peanut Butter Desserts


Don't forget to pin it!!
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Peanut Butter Bars with Oatmeal

Peanut Butter Bars with Oatmeal

Servings: 20
Author: Rachel
Prep time: 20 MinCook time: 20 MinTotal time: 40 Min
A soft peanut butter cookie bar with an extra layer of peanut butter and slathered with chocolate frosting. You know you want some!


Peanut Butter Bars
  • 3/4 c. peanut butter
  • 3/4 c. butter, softened
  • 3/4 c. sugar
  • 3/4 c. brown sugar
  • 2 eggs
  • 1/2 t. vanilla
  • 3/4 t. baking soda
  • 1/2 t. salt
  • 1 1/2 c. flour
  • 1 1/2 c. quick oats
  • 1/2 c. peanut butter - to spread on top
  • 1/4 c. butter, softened
  • 1-2 T. cocoa
  • 2-3 T. milk
  • 1 t. vanilla
  • 2-3 c. powdered sugar


Peanut Butter Bars
  1. Cream together peanut butter, butter and sugar.
  2. Add eggs and vanilla and mix well.
  3. Sift in soda, salt and flour. Mix well
  4. Stir in quick oats.
  5. Spread in a greased 9 X 13 pan. 
  6. Bake at 350 for 20 minutes. 
  7. Place 1/2 cup of peanut butter on top of bars in small dabs.
  8. Put back in oven for 2 minutes.
  9. Spread melted peanut butter evenly over bars.
  10. Cool completely, then frost with chocolate frosting.
  1. Beat butter until soft and creamy.
  2. Add cocoa, vanilla, milk and powdered sugar and mix thoroughly.
  3. If frosting is too dry, add more milk 1 tablespoon at a time.
  4. If frosting is too runny, add more powdered sugar 1/4 c. at a time.


Do not over bake. The peanut butter bars will be dry if over baked. They should still jiggle in the middle when you pull them out of the oven. Depending on your preference, or what you have on hand, crunchy or creamy peanut butter will work. For a double batch, bake in a 10 X 15 jelly roll pan.

Nutrition Facts



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Nutritional information is generated automatically and not guaranteed to be accurate.

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Desserts, Peanut Butter Treats


  1. I agree Rachel... homemade is always better and these bars look delicious!
    Thank you for sharing your recipes at Create, Bake, Grow and Gather this week.

  2. We featured your awesome post at Full Plate Thursday,454! Thanks so much for sharing your talent with us and hope you will come back soon!
    Miz Helen