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Peanut Butter Mississippi Mud Blondies

5 Reviews

Cannot stop making this!! Peanut Butter Mississippi Mud Brownies ohsweetbasil.com

How sick of peanut butter are you all? Because heaven knows I post enough of it. I just cannot help it! It’s so darn creamy and delightful! This particular recipe for Peanut Butter Mississippi Mud Blondies has actually been a 3 year long process.

Cannot stop making this!! Peanut Butter Mississippi Mud Brownies ohsweetbasil.com

It shouldn’t be this hard but I kept testing blondie recipes and peanut butter blondies and they just weren’t perfect.

Cannot stop making this!! Peanut Butter Mississippi Mud Brownies ohsweetbasil.com

I like my brownies and bars to be chewy and not cake like so there was that issue right there, but then I also found many recipes ended up really dry or had too much texture with the addition of oats or nuts. No, I wanted a chewy, gooey, melt in your mouth bar that made your eyes roll back in your head. And I mean that in a good way, not a “I just died these were so bad”.

Cannot stop making this!! Peanut Butter Mississippi Mud Brownies ohsweetbasil.com

I found that softened, unsalted butter was the key unlike many blondies that called for melted butter. Also beating the butter and sugar together for a full minute helped the batter lighten up just enough that they weren’t cake like but they were chewy and gooey. I experimented with white, brown, dark brown and combinations but in the end pure brown sugar ended up being best. And of course peanut butter in the batter as opposed to just peanut butter chips. This really brought on the nutty flavor. It’s like a blondie and lunch lady peanut butter bar got married. Love is totally in the air.

Cannot stop making this!! Peanut Butter Mississippi Mud Brownies ohsweetbasil.com

The marshmallows, well mini worked best as the large mallows ended up too puffy and aired out in the middles thus reducing the gooey factor. And marshmallow creme was just too sweet. Don’t ask me why, it’s just how I feel. The chocolate frosting was a back and forth ordeal. Originally I wanted to use Mom’s Texas Sheet Cake cooked chocolate frosting, but it didn’t give enough chocolate flavor to balance everything out and a ganache just totally ran and solidified so that was out. I ended up with a simple chocolate frosting and I’m in pure heaven. Next up, a cookie version so stay tuned!

Is Confectioners Sugar The Same As Powdered Sugar?

They are the same thing. Sometimes it’s also called icing sugar.

What are Blondies?

Blondies are a rich, sweet cookie bar.

They resemble chocolate brownies, but the chocolate is replaced by vanilla, and they contain brown sugar.

Can You Substitute Almond Butter for Peanut Butter in Recipes?

Almond butter has the same thick, creamy consistency as peanut butter.

Almond butter also has a good “nut” flavor.

You can substitute almond butter for peanut butter in recipes.

Peanut Butter Mississippi Mud Blondies

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Cannot stop making this!! Peanut Butter Mississippi Mud Brownies ohsweetbasil.com

Peanut Butter Mississippi Mud Blondies

4.6 from 5 votes
Prep Time: 15 minutes
Cook Time: 28 minutes
Total Time: 43 minutes
Servings: 9


  • 1/4 Cup Butter softened
  • 1 Cup Brown Sugar
  • 1/4 Cup Peanut Butter
  • 1 Large Egg
  • 2 Teaspoons Vanilla
  • 1 Cup Flour
  • 1/2 Teaspoon Baking Powder
  • 1/4 Teaspoon Salt
  • 1/2 Cup Peanut Butter Chips
  • 2 Cups Mini Marshmallows


  • 1/4 Cup Butter softened
  • 3 Tablespoons Cocoa Powder
  • 2 Cups Powdered Sugar
  • 1/4 Cup Heavy Cream plus 2 Tablespoons
  • 1/4 Teaspoon Vanilla


  • Preheat the oven to 350 degrees and line an 8x8" baking pan with parchment paper sprayed lightly with nonstick spray.
  • In the bowl of a standing mixer, cream together the butter and brown sugar for 1 minute.
  • Add the peanut butter and mix for 30 seconds.
  • Add the egg and vanilla and beat until smooth, scraping down the sides.
  • In a medium bowl, whisk together the flour, baking powder and salt.
  • Add to the wet ingredients and mix until combined.
  • Fold in the peanut butter chips.
  • Press the dough into the pan and bake for 25-28 minutes, remove from the oven and top with marshmallows then bake an additional 1-2 minutes.
  • Remove the pan from the oven and allow to cool for 10 minutes then add dollops of frosting and allow to sit another few minutes to soften the frosting.
  • Spread gently with a spatula and serve.

For the frosting

  • In a large bowl, using a hand mixer, beat the butter and cocoa.
  • Add the powdered sugar, cream and vanilla and beat until smooth.


can be frozen for 2-3 months
Nutrition Facts
Peanut Butter Mississippi Mud Blondies
Amount Per Serving (1 g)
Calories 519
% Daily Value*
Cholesterol 61.4mg20%
Carbohydrates 68.4g23%
Fiber 2.1g9%
Sugar 50.9g57%
Protein 7.8g16%
* Percent Daily Values are based on a 2000 calorie diet.

Peanut Butter Mississippi Mud Brownies


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About the authors

carrian feik cheney oh sweet basil

Cade and Carrian have three children and love to spend time together whether it’s vacationing or snuggled up on the couch for a good movie.

And this family especially loves to eat.

They love everything from the keep you fit and healthy to the get out your sweat pants indulgent and everything in between.

But most of all, they love the memories made, shared and treasured and it’s all thanks to a meal shared together with loved ones.

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Recipe Rating


  • I AM NEVER TIRED OF PB! esp. when there are marshmallows and just this overall deliciousness!

    • Reply
  • I eats peanut butter right out of the jar.Always have! Life gets busy,a spoonful gets me rolling again. These bars look scrumptious,even though was sorta grossed out on sweets. 2 weeks of straight up candy making,you know how that is. Happy New Year, and thanks for posting a treat, and not die-et or “healthy, clean, green, or whatever dad is happening!

    • Reply
    • oh yes, the hoidays are so full of candies! Too much for sure!

      • Reply
  • I’m definitely not sick of peanut butter (I don’t think I could ever be), especially when I see these awesome looking bars! I have to try these ASAP! 😀

    • Reply
  • NEVER sick of peanut butter – it is essential to life!!! Thanks for the great peanut butter recipes!!!

    • Reply
    • Right? It never gets old to me!

      • Reply

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