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No Bake Peanut Butter Marshmallow Bars Recipe

No bake peanut butter marshmallow bars are an easy dessert that you can whip up quickly and without any hassle. They’re perfect for dessert, an afternoon snack, or an after school treat for your kids.

peanut butter marshmallow bars on a plate

If your children are big enough to see the top of the counter, either standing on the floor or on a stool, they can help you make them. They’ll be so proud of the delicious treat that the whole family will enjoy!

Easy Peanut Butter Marshmallow Squares

Whether you make this delicious treat into bars or squares, the flavor is melt-in-your-mouth delicious! 

Every single thing about making these delicious treats is easy. First of all, you only need a few ingredients. The prep time is short because you can use your microwave. Or if you prefer, you can use the stovetop. Either way is easy.

peanut butter marshmallow bar on a plate

What takes the longest is letting it set. In fact, it seems longer than it actually is because you’re going to want to gobble one up right away. This is one of those recipes that I love to make because I’m totally crazy about peanut butter.


As I mentioned, you only need a few ingredients. You probably have some of them in your pantry and fridge, so they are also budget friendly.

Here is what you’ll need:

  • Softened butter
  • Creamy peanut butter
  • Peanut halves
  • Butterscotch chips
  • Mini marshmallows
peanut butter, marshmallows, peanuts, butter, and butterscotch chips

For exact measurements of each ingredient and full directions, go to the recipe card at the bottom of the page. You can even print out the card by using the “print” button.

If you have crunchy peanut butter, you can use that as well. I prefer to use creamy peanut butter and add the peanuts to get the ratio I like.

We always have some sort of peanut butter at our house. In fact, there’s a good chance that we have creamy, crunchy, and homemade peanut butter.

You can also use chocolate chips instead of butterscotch. Or you can use peanut butter chips. If you have time, make a variety. This is one of those times when more is better.

Prepare the Tools and Ingredients

Before I get started, I like to get all of the tools and ingredients ready. That makes it easier to breeze through this peanut butter bars recipe.

Sometimes I measure everything in advance. Do whatever you’re most comfortable doing to get ready to make the recipe. 

Spray the interior of an 8” x 8” or 7” x 11” pan with your favorite nonstick cooking spray. I used the rectangular pan instead of a square one because that was what I had closest to me.

baking pan sprayed with nonstick spray

If you’re making these no bake peanut butter marshmallow bars for a larger crowd, you can double the recipe. And use a 9” x 13” baking pan to accommodate the larger batch.

How to Make No Bake Peanut Butter Marshmallow Bars

Now combine the butter and peanut butter in a microwave safe bowl.

butter and peanut butter in a bowl

Stir until the 2 ingredients are blended. Add the butterscotch chips and stir.

Place the bowl in the microwave for 1 minute.

Remove the bowl and stir the mixture.

blended peanut butter mixture

Chances are, the butterscotch chips won’t be melted, so return the bowl to the microwave for 30 more seconds and then stir again. 

Continue to repeat the process until the butterscotch chips have melted, and all of the ingredients are well mixed. It should only take about 3 or 4 minutes total time.

Now set the mixture aside to cool for about 5 minutes. You don’t want the marshmallows to melt when you add them.

marshmallows and peanuts added to the mixture

After the mixture has cooled to the point of being warm to touch but not hot, add the marshmallows and peanuts. Stir the mixture until everything is coated.

marshmallows and peanuts stirred into the peanut butter mixture

Spread the mixture into the greased pan and smooth the top until it is as even as you can get it.

It will have a bumpy texture from the marshmallows and peanuts, and that’s fine.

Stick the pan in the refrigerator and walk away for about an hour or two. I know it’s hard, but this step is very important.

After the mixture has set, it’s ready to be cut into bars. Enjoy!

peanut butter marshmallow bars in a pan and on a plate

See this recipe shared at Full Plate Thursday and Weekend Potluck.

More Delicious Recipes with Peanut Butter

If you enjoy peanut butter as much as I do, you’ll enjoy some of these delicious peanut butter recipes. They’re all easy and delicious, so give them a try!

Peanut Butter Mug Cake – I love the fact that this is made without flour, which makes it gluten free!

Chocolate Peanut Butter Moose Munch – This treat is perfect for TV night, game night, or just plain old snack time. And it’s addictive!

2 Ingredient Peanut Butter Fudge – You can’t get any easier than this recipe! And it’s absolutely out of this world delicious!

Oatmeal Peanut Butter Bars – I started out making this as a breakfast food. But it’s so good we enjoy it for dessert!

Pineapple Coconut Cake – This easy cake mix from Out of the Box Baking combines 2 of my favorite flavors! Pineapple and coconut! Mmmm!

Peanut Butter Cookies – Here’s another flourless recipe that results in lots of melt-in-your-mouth goodness!

Peanut Butter Pound Cake – What’s better than a plain peanut butter pound cake? This peanut butter pound cake with peanut butter glaze from Call Me PMc. So good you’ll want seconds!

Peanut Butter Fudge Bars – Peanut butter and chocolate come together in the most delicious way!

Peanut Butter Cocoa Krispie Treats – How many ways can you say, “Yum”? That’s what you’ll have to figure out when you taste these treats!

What to Do with No Bake Leftover Peanut Butter Marshmallow Bars

If you have any of these delicious bars left, place them in an airtight container and put them in the freezer. I like to use freezer bags that I can label with the date. These yummy treats will be good for up to 3 months.

peanut butter marshmallow bars on a plate

When you’re ready to eat them, remove them from the freezer and allow them to thaw for about an hour. Then they’ll be as good as the day you made them!

peanut butter marshmallow bar on a plate

No Bake Peanut Butter Marshmallow Bars

Yield: 12 bars
Prep Time: 10 minutes
Additional Time: 1 hour
Total Time: 1 hour 10 minutes

If you like peanut butter, you'll love these delicious no bake peanut butter marshmallow bars. They're perfect for dessert or any celebration!


  • 2 tablespoons softened butter
  • 1 cup creamy peanut butter
  • 1/2 cup peanut halves
  • 1/2 package of butterscotch chips (5-6 ounces)
  • 8 ounces of mini marshmallows


  1. Spray the interior of an 8” x 8” or 7” x 11” baking pan with nonstick cooking spray. Set it aside.
  2. Combine the butter and peanut butter in a microwave safe bowl. Stir until mixed.
  3. After they are blended, add the butterscotch chips and stir and put the bowl in the microwave for 1 minute. Stir. Continue to microwave in 30 second increments until all of the butterscotch chips have melted, stirring in between each session.
  4. Allow the mixture to cool for about 5 minutes.
  5. Pour the marshmallows and peanuts into the mixture and stir.
  6. Spread the mixture into the greased pan. Smooth the top until it is even.
  7. Refrigerate for 1-2 hours. Cut into bars and serve.
Nutrition Information
Yield 12 Serving Size 1
Amount Per Serving Calories 277Total Fat 18gSaturated Fat 5gTrans Fat 0gUnsaturated Fat 10gCholesterol 5mgSodium 164mgCarbohydrates 27gFiber 2gSugar 17gProtein 7g

The nutrition information is a product of online calculators. I try to provide true and accurate information, but these numbers are estimates.

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Miz Helen

Thursday 2nd of June 2022

We are featuring your awesome post on Full Plate Thursday, 591 this week. Thanks so much for sharing with us and come back to see us real soon! Miz Helen

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