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5-Minute Peanut Butter Fudge

Featured in: Sweet & Soft Treats

This creamy peanut butter fudge blends smooth peanut butter, buttery richness, and powdered sugar for a luscious texture. Mini marshmallows add soft, sweet bursts throughout, creating a delightful contrast. The mixture is melted, combined, gently folded, then chilled to set into squares. A sprinkle of roasted peanuts on top delivers added crunch and nutty depth. No baking needed; preparation takes just minutes, making it ideal for last-minute indulgences or thoughtful homemade gifts.

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Updated on Mon, 24 Nov 2025 12:49:00 GMT
Close-up of decadent 5-Minute Peanut Butter Marshmallow Fudge, swirled with marshmallow fluff, awaiting a bite. Pin This
Close-up of decadent 5-Minute Peanut Butter Marshmallow Fudge, swirled with marshmallow fluff, awaiting a bite. | duneoven.com

A creamy, sweet, and indulgent fudge featuring peanut butter and mini marshmallows, made in just minutes without baking. Perfect for last-minute desserts or gifting.

This peanut butter marshmallow fudge quickly became my go-to treat when I needed something sweet and easy to make. The combination of creamy peanut butter and soft marshmallows is simply irresistible.

Ingredients

  • Base: 2 cups creamy peanut butter 1/2 cup unsalted butter 3 1/2 cups powdered sugar 1 teaspoon vanilla extract
  • Mix-Ins: 2 cups mini marshmallows
  • Topping (optional): 1/4 cup roasted peanuts, chopped

Instructions

Step 1:
Line an 8x8-inch (20x20 cm) baking pan with parchment paper, leaving an overhang for easy removal.
Step 2:
In a large microwave-safe bowl, combine peanut butter and butter. Microwave for 1–2 minutes, stirring every 30 seconds, until melted and smooth.
Step 3:
Add vanilla extract and stir to combine.
Step 4:
Gradually mix in powdered sugar until smooth and thick.
Step 5:
Gently fold in mini marshmallows until evenly distributed.
Step 6:
Spread the mixture evenly into the prepared pan. Sprinkle chopped peanuts on top if desired, pressing them lightly into the surface.
Step 7:
Refrigerate for at least 1 hour, or until firm.
Step 8:
Lift fudge from pan using parchment overhang. Cut into 16 squares. Serve chilled.
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This fudge always brings smiles when shared with family and friends during cozy gatherings and celebrations.

Required Tools

Microwave-safe mixing bowl Spatula 8x8-inch baking pan Parchment paper Knife

Allergen Information

Contains peanuts, dairy (butter), and may contain gluten if marshmallows or powdered sugar are processed in facilities with gluten Always check labels for potential allergens.

Nutritional Information (per serving)

Calories: 225 Total Fat: 14 g Carbohydrates: 23 g Protein: 4 g

Squares of creamy 5-Minute Peanut Butter Marshmallow Fudge studded with marshmallows, ready for dessert. Pin This
Squares of creamy 5-Minute Peanut Butter Marshmallow Fudge studded with marshmallows, ready for dessert. | duneoven.com

Enjoy this easy and delicious fudge that is perfect for any occasion and easy to share.

Recipe FAQ

→ Can I use crunchy peanut butter instead?

Yes, crunchy peanut butter adds extra texture but may alter the smoothness slightly.

→ How long should the fudge chill before serving?

Chill for at least one hour to allow the fudge to firm up properly.

→ Can I add chocolate chips to this fudge?

Swirling in melted chocolate chips before adding marshmallows creates a rich twist.

→ Is there a nut-free alternative for peanut butter?

Almond or sunflower seed butters work well; ensure marshmallows are nut-free too.

→ How should I store leftover fudge?

Keep leftovers in an airtight container in the refrigerator for up to one week.

5-Minute Peanut Butter Fudge

A creamy, sweet peanut butter and marshmallow dessert, made quickly without baking.

Prep Time
5 minutes
0
Total Duration
5 minutes
Published by Dune Oven Sara Whitfield

Recipe Category Sweet & Soft Treats

Skill Level Easy

Cuisine Type American

Servings Made 16 Portions

Dietary Details Vegetarian-Friendly

What You Need

Base

01 2 cups creamy peanut butter
02 0.5 cup unsalted butter
03 3.5 cups powdered sugar
04 1 teaspoon vanilla extract

Mix-Ins

01 2 cups mini marshmallows

Topping (optional)

01 0.25 cup roasted peanuts, chopped

How To Make It

Step 01

Prepare pan: Line an 8x8-inch baking pan with parchment paper, leaving an overhang for easy removal.

Step 02

Melt peanut butter and butter: Combine peanut butter and butter in a large microwave-safe bowl. Microwave for 1 to 2 minutes, stirring every 30 seconds until melted and smooth.

Step 03

Add vanilla: Stir in vanilla extract until fully incorporated.

Step 04

Incorporate powdered sugar: Gradually add powdered sugar, mixing until the mixture is smooth and thick.

Step 05

Fold in marshmallows: Gently fold mini marshmallows into the mixture until evenly distributed.

Step 06

Transfer mixture: Spread the mixture evenly into the prepared pan. If desired, sprinkle chopped peanuts on top and press lightly into the surface.

Step 07

Chill: Refrigerate for at least 1 hour, or until firm.

Step 08

Slice and serve: Lift the fudge from the pan using the parchment paper overhang and cut into 16 squares. Serve chilled.

Things You'll Need

  • Microwave-safe bowl
  • Spatula
  • 8x8-inch baking pan
  • Parchment paper
  • Knife

Allergens

Review every ingredient for allergens and speak with a healthcare provider when unsure.
  • Contains peanuts and dairy; may contain gluten depending on marshmallow and powdered sugar processing. Check labels carefully.

Nutrition Details (per serving)

Nutrition is for your information and isn’t meant as medical advice.
  • Calories: 225
  • Fats: 14 g
  • Carbohydrates: 23 g
  • Proteins: 4 g