Fudge Frosted Peanut Butter Blondie Bars

Fudge Frosted Peanut Butter Blondie Bars - this frosting is OUTRAGEOUS!

You guys. I have done something major here. Like, put me down in the history books or something, because this is big.

I perfected chocolate frosting.

This stuff…oh. It’s divine. It’s so fudgy and rich and just plain perfect.

Fudge Frosted Peanut Butter Blondie Bars - this frosting is OUTRAGEOUS!

I really love fudgy chocolate frosting, but I’ve always struggled getting it just right. I don’t like cooca frosting recipes and I don’t have a ton of success with melted chocolate recipes. Then it hit me. If you want fudgy frosting, why not add hot fudge?

You may have noticed that I have an obsession with hot fudge? Hello, hot fudge banana bread, sundae cookie bars, hot fudge peanut butter bars, and hot fudge strawberry donut pudding.

Fudge Frosted Peanut Butter Blondie Bars - this frosting is OUTRAGEOUS!

Well, hot fudge is absolutely amazing in frosting. This recipe is super similar to the jars of frosting you can get by the cake mixes, without the weird after taste (am I the only one who notices the chemical aftertaste in pre-made baked stuff these days?) and you know exactly what is going into this recipe. Well, except for the hot fudge, but you could totally go homemade with the fudge ripple in this Peanut Butter Fudge Ice Cream recipe!

Anyway, I insist that y’all try this frosting! I slathered it on the most amazing peanut butter blondies ever! They just melt in your mouth!

Fudge Frosted Peanut Butter Blondie Bars - this frosting is OUTRAGEOUS!

PrintPrint Recipe

Fudge Frosted Peanut Butter Blondie Bars

Yield: 16 bars

Prep Time: 10 minutes

Cook Time: 20 minutes

Total Time: 30 minutes


For the bars:
1 1/3 cups packed brown sugar
1/4 cup butter, melted
1/2 cup creamy peanut butter
1 tsp vanilla
3 eggs
1 1/2 cups all-purpose flour
3/4 tsp baking powder
1/4 tsp baking soda
1/2 tsp salt

For the frosting:

1/2 cup butter, softened
1/2 cup hot fudge ice cream topping
1 cup powdered sugar
3 tablespoons unsweetened cocoa powder
1 tablespoon heavy cream or milk
1 teaspoon vanilla
1/4 teaspoon salt


To make the bars:
Preheat the oven to 350 degrees. Spray a 9x13 baking dish with non-stick cooking spray.
In the bowl of a stand mixer, beat together sugar, peanut butter, butter, vanilla, and eggs until well blended. Mix in flour, baking powder, baking soda, and salt.
Spread into baking dish and bake for 25-30 minutes or until a tester comes out fairly clean.
Let cool completely before frosting and cutting.
To make the frosting:
Add the butter and hot fudge to the bowl of a stand mixer fitted with the whisk attachment. Beat until well combined. With the mixer on low, slowly add the powdered sugar, cocoa powder, cream, vanilla, and salt. Beat until well combined.

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24 Responses to “Fudge Frosted Peanut Butter Blondie Bars”

  1. Taylor @ Food Faith Fitness February 21, 2014 @ 6:13 am (#

    OH NO YOU DIDN’T?! Peanut butter blondies WITH fudge frosting?! And PERFECT fudge frosting? I am dying. Drooling. Need this. Want all the fudge frosted peanut butter blondie bars!


  2. Ashton February 21, 2014 @ 7:09 am (#

    OMG. Hot Fudge in the frosting!?!?!?! That’s brilliant!! Mind completely blown and utterly transfixed and obsessed over these bars. I want them in my mouth NOW! Now I have two must make recipes from you for this weekend…. my waistline is not pleased 😉


    • Karly replied: — February 21st, 2014 @ 9:11 pm


      Oh, who cares about waistlines anyway? :)


  3. Madison February 21, 2014 @ 7:30 am (#

    OOOOh yes–perfect combo ever. AND the fact that there is hot fudge in the frosting, how could this be wrong? Its so right. SOOOO right.


  4. marcie February 21, 2014 @ 8:08 am (#

    Hot fudge frosting sounds like the greatest idea ever! That is huge, Karly, and I love the looks of it!


  5. Belinda@themoonblushbaker February 21, 2014 @ 8:14 am (#

    That icing is drool worthy! I am so about hot fudge right now.


  6. Jodi February 21, 2014 @ 8:16 am (#

    Oh Karly, these look divine. I am the biggest fan of chocolate and peanut butter, I swear it’s a match made in heaven. I can’t wait to try these!


  7. Kathi @ Deliciously Yum! February 21, 2014 @ 8:19 am (#

    Oh my! This frosting looks beyond incredible! You had me at fudgy, rich and perfect. I am dying over this. Yum!


  8. Katrina @ WVS February 21, 2014 @ 10:47 am (#

    That frosting truly looks killer! LOVE!


  9. Erin @ The Spiffy Cookie February 21, 2014 @ 12:06 pm (#

    Oh there’s even sprinkles of salt on top! Swoon.


  10. Jessica @ A Kitchen Addiction February 21, 2014 @ 2:53 pm (#

    Hot fudge in the frosting?! You are brilliant!


  11. Angelyn @ Everyday Desserts February 21, 2014 @ 3:34 pm (#

    That frosting really does look divine! I’m pretty sure I need to make these soon..


  12. Kayle (The Cooking Actress) February 21, 2014 @ 8:44 pm (#

    GENIUS! Love that you made this frosting with hot fudge-that’s why it looks SO perfectly rich! and mmmm these pb bars look delectable


  13. Paula – bell’alimento February 22, 2014 @ 11:24 am (#

    I am drooling all over my keyboard looking at these beauties! These look and sound AMAZING!


  14. Emily @ Life on Food February 22, 2014 @ 11:51 am (#

    Oh my goodness these look good. I love chocolate and peanut butter. I cannot wait to try this chocolate frosting out. Lately I have had the worst cravings for chocolate at night. Yesterday I was dying for hot fudge sauce.


  15. Stephanie @ Eat. Drink. Love. February 22, 2014 @ 11:12 pm (#

    These look amazing! I love the frosting!


  16. Joanne February 23, 2014 @ 7:22 am (#

    I want to marry these blondies.


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