Peanut Butter Fudge Iced Brownies

Name: Peanut Butter Fudge Iced Brownies
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Ingredients: 1 box brownie mix (prepared according to package directions*); 1-½ cups sugar; 7 tablespoons milk; 2 tablespoons shortening; 2 tablespoons margarine; ¼ teaspoon salt; 1 teaspoon vanilla; ½ cup creamy peanut butter

One bite of these Peanut Butter Fudge Iced Brownies is all it takes to understand why they’ve been a longtime favorite! The old-fashioned boiled peanut butter icing creates a thick, candy-like layer over fudgy brownies for a decadent treat that tastes like it came straight from grandma’s kitchen. Make it once and it’ll be in your regular rotation!

Brownies + Peanut Butter Fudge Icing = A Match Made in Heaven

This icing has been a family staple since I first shared it on Southern Plate back in 2008… and honestly, I’ve lost count of how many of you have made it since!

We’ve always done it over yellow cake, but the day I poured it over brownies, everything changed. A dense, fudgy brownie is the perfect base for this old-fashioned boiled peanut butter icing.

These peanut butter fudge iced brownies perfectly combine rich chocolate with a thick, candy-like peanut butter topping. It’s a combination that feels like it was always meant to be, and once you try it, you’ll wonder why you ever had brownies any other way!

Ingredients

Boxed brownie mix
Sugar
Milk
Shortening
Margarine
Salt
Vanilla
Creamy peanut butter

Frequently Asked Questions

Which brownie mix do you recommend?

I usually get Kroger or some other generic brand – nothin’ fancy here! I’d go for whatever is cheapest where you shop because I’ve never met a brownie mix I didn’t like 😊.

You don’t have to use two boxes of mix, one is fine and you get to taste more of the icing!

Want to make your brownies extra fudgy?

To make your brownies thicker, use two boxes of brownie mix. This is how I like to do it! If you do this, you need to cut your oven temperature down to 325°F and add about 15 minutes to the baking process.

Can I make my brownies from scratch instead?

Of course! You can use your own recipe or I recommend my friend Susan Spencer’s Grandmothers recipe for Blue Ribbon Brownies. The peanut butter icing will take on the star of the show so go with whatever you prefer and what you have time for, but as for me and my house, we will make them from a mix today.

How to Make Peanut Butter Fudge Iced Brownies

Step 1: Preheat the Oven

Preheat your oven to 350°F and spray a 9×13 or 8×8 inch baking pan.

Two boxes of cake mix behind cooked brownies in a pan.

Tip: If making an 8×8 inch pan of brownies, I’d still use this same amount of icing and just let it be thicker.

Step 2: Mix & Bake Your Brownies

First, you’ll need to whip up some brownies. Just follow the directions on the package. Once they’re baked, let them cool completely before you start on the icing.

Ingredients for peanut butter fudge icing.

Step 3: Make the Icing

Place your milk, sugar, shortening, margarine, and salt in a good sauce pot and put this over medium heat.

Mixing milk, sugar, and butter in a mixing bowl with a slotted wooden spoon.

Mixing butter, shortening, milk, and sugar in a pan.

Stir constantly while you wait on all of it to melt and come to a boil. Then stop and let it boil on its own (no stirring) for 2 minutes.

Melted butter, milk, shortening, and sugar in a pot over the stove.

Step 4: Beat it, Spread it, & Serve

Remove from heat and stir in your vanilla and peanut butter.

Adding vanilla extract to a buttery liquid over the stove.

Adding peanut butter to melted butter for peanut butter fudge icing.

Beat that until it’s nice and smooth, then spread it over your brownies as fast as you can.

Peanut butter fudge icing in a pot with a wooden slotted spoon.

Spreading the peanut butter fudge icing on fresh brownies.

Now allow for the icing to cool and set on your brownies. You can occupy yourself during this time by licking the sauce pot clean once it cools enough to let you 😉.

Serve & enjoy!

How to Store Peanut Butter Fudge Iced Brownies

Store your delicious Peanut Butter Fudge Iced Brownies in an airtight container at room temperature for up to 3 days. Alternatively, you can store them in the refrigerator for up to 5 days.