Best Peanut Butter Fudge with Marshmallow Fluff: 5 Minutes
I ruined two batches of peanut butter fudge with marshmallow fluff before I figured out that every recipe I’d tried was actually a different method wearing the same name. One boiled sugar to a candy thermometer temperature. Another skipped the stove completely and used condensed milk. No wonder my first attempt turned out grainy and my second never set.
This peanut butter fudge with marshmallow fluff recipe uses the classic stovetop method, with a full stovetop vs. no-bake comparison, a fluff vs. creme vs. regular marshmallows breakdown, and real troubleshooting for grainy or gritty fudge that won’t set. Whatever you call it — peanut butter fudge with marshmallow cream, marshmallow fluff peanut butter fudge, or pb fudge with marshmallow fluff — the method below works the same way.
This dessert goes by a lot of different names depending on where you learned it — peanut butter marshmallow fluff, fudge marshmallow fluff, pb fudge with marshmallow creme, peanut butter fudge recipe with marshmallow fluff, peanut butter fudge marshmallow fluff recipe, peanut butter fudge recipe with marshmallow cream, marshmallow fluff peanut butter fudge recipe, peanut butter fudge made with marshmallow fluff, or peanut butter fudge using marshmallow fluff.
They’re all the same method with the same result — only the name changes by region and generation. This is genuinely an easy peanut butter fudge with marshmallow fluff recipe, and one of the easiest peanut butter fudge recipes with marshmallow fluff you’ll find, whether you’re searching for a fudge recipe with peanut butter and marshmallow fluff for the first time or looking to fix a batch that didn’t set. Some cooks know it as peanut butter fudge marshmallow cream, others as peanut butter marshmallow cream fudge or peanut butter and marshmallow cream fudge — same dessert either way.
No-Bake Option Included • Gluten-Free • 5-Minute Cook Time
Quick Summary
Peanut butter fudge with marshmallow fluff is made by boiling sugar and evaporated milk for 3-5 minutes, then stirring in marshmallow fluff and peanut butter off the heat. This recipe covers a stovetop vs. no-bake comparison, a fluff vs. creme vs. regular marshmallows guide, and troubleshooting for grainy fudge or fudge that won’t set. A no-bake condensed-milk variation is included for anyone who wants to skip the stove entirely.
Recipe Snapshot
| Prep Time | Cook Time | Yields | Calories | Course |
| 10 minutes | 5 minutes | 36 pieces | 108 per piece | Dessert |
Ingredients
- 2 cups granulated sugar
- 2/3 cup evaporated milk (not sweetened condensed milk)
- 1/4 teaspoon salt
- 7 tablespoons butter
- 1 (7-ounce) jar marshmallow fluff (see comparison below)
- 1 1/2 cups creamy peanut butter (not natural-style)
- 1 teaspoon vanilla extract
Tools You’ll Need
- Heavy-bottomed 3-quart saucepan
- 8×8-inch baking pan
- Parchment paper
- Wooden spoon
- Candy thermometer (optional, see doneness guide below)
Marshmallow Fluff vs. Marshmallow Creme vs. Regular Marshmallows
This is where most peanut butter fudge recipes get confusing, since the terms get used interchangeably even though they behave differently in fudge:
| Product | What It Is | Works in This Recipe? |
| Marshmallow Fluff | A specific brand-name spreadable marshmallow product, sold in jars | Yes — this recipe |
| Marshmallow Creme | The generic term for the same style of product (Jet-Puffed, store brands) | Yes — identical use |
| Regular Marshmallows | Whole or mini marshmallows, coated in cornstarch to prevent sticking | Not recommended — the cornstarch coating dries out the fudge |
If marshmallow fluff genuinely isn’t available where you live, regular marshmallows can work in a pinch — measure 7 ounces by weight rather than by cup, since they pack differently than fluff.
How to Make Peanut Butter Fudge with Marshmallow Fluff, Step by Step
1. Line an 8×8-inch baking pan with parchment paper, leaving overhang on two sides for easy removal.
2. In a heavy-bottomed saucepan, melt the butter over medium heat. Swirl it up the sides of the pan to grease the edges.
3. Pour in the evaporated milk, then slowly add the sugar and salt to the center of the pan. Stir until fully dissolved — rub a bit between your fingers to check for grit before moving on.
4. Bring the mixture to a full rolling boil over medium-high heat, stirring constantly. Boil for 3-5 minutes (see the doneness guide below for exact timing).
5. Remove from heat. Working quickly, stir in the marshmallow fluff and peanut butter until smooth, then add the vanilla extract.
6. Immediately pour the fudge into the prepared pan and smooth into an even layer. Don’t scrape the sides of the pot into the pan — any dried bits will make the top grainy.
7. Let the fudge cool at room temperature for at least 2 hours, until fully set.
8. Lift the fudge out using the parchment overhang, then slice into 1-inch squares.
How Do You Know When the Fudge Is Done Boiling?
This is the step that trips up most first-time fudge makers, and different recipes test for it in genuinely different ways:
| Method | How It Works | Best For |
| Candy thermometer | Boil until the mixture reads 234-236°F (soft-ball stage) | Most accurate, no guesswork |
| Ice-water soft-ball test | Drop a bit of the boiling mixture into ice water; it should form a soft, pliable ball | No thermometer needed, slightly more practice required |
| Timed boil (this recipe) | Boil at a full rolling boil for exactly 3-5 minutes, stirring constantly | Simplest for beginners, works reliably with a heavy pan |
Any of the three methods works. If you have a candy thermometer, use it — it removes almost all the guesswork from peanut butter fudge with marshmallow fluff and is the most foolproof option for a first attempt. The soft-ball stage (234-236°F) is the same temperature range candy-making science has used for generations to identify when sugar syrup is ready for fudge, pralines, and fondant.
Stovetop vs. No-Bake: Which Method Should You Use?
Search for peanut butter fudge with marshmallow fluff online and you’ll find two genuinely different methods presented as the same recipe. Here’s how they actually compare:
| Method | Key Ingredients | Texture | Effort |
| Stovetop boiled (this recipe) | Sugar, evaporated milk, fluff, peanut butter | Classic fudge texture — dense, smooth, slightly crumbly | Medium — requires boiling and timing |
| No-bake | Condensed milk, white chocolate, fluff, peanut butter | Softer, creamier, more like a set ganache | Low — no stovetop cooking, microwave only |
Neither version is more correct than the other — they’re just different textures wearing the same name. See the No-Bake Version in the variations section below for the full method.
Why Is My Peanut Butter Fudge Grainy or Won’t Set?
These are the two most common complaints with this style of fudge:
- Grainy or gritty texture: Almost always means the sugar wasn’t fully dissolved before the mixture came to a boil, or the fudge boiled too long and started to crystallize. Always check for grit between your fingers before increasing the heat, and stick to the timing in the doneness guide above.
- Fudge that stays soft or goopy: Usually means the sugar mixture didn’t boil long enough to reach the right stage. Unfortunately, this isn’t fixable after the fact — a brief fridge chill will firm it up temporarily, but it will turn sticky again at room temperature. The real fix is remaking the batch and boiling for the full time in the doneness guide above, or using a candy thermometer to confirm it actually hits 234-236°F next time.
- Dry, crumbly fudge: Usually caused by overcooking the sugar mixture past the right stage, or using a thin pan that creates hot spots and scalds the mixture unevenly. A heavy-bottomed pan makes a real difference here.
Variations to Try
No-Bake Peanut Butter Fudge with Marshmallow Fluff
For a completely no-bake peanut butter fudge with fluff, melt 12 ounces of white chocolate with 1 1/2 cups peanut butter in the microwave in 30-second bursts. Stir in one 14-ounce can of sweetened condensed milk until thick, then swirl in the marshmallow fluff on top rather than mixing it in fully. Chill in the refrigerator for 30 minutes before slicing.
Microwave Peanut Butter Fudge
For microwave peanut butter fudge with marshmallow fluff, combine the sugar, evaporated milk, and butter in a microwave-safe bowl and cook on high in 2-minute bursts, stirring between each, until the mixture reaches a full boil for a total of about 4 minutes. Remove and stir in the fluff, peanut butter, and vanilla as usual.
Chocolate Peanut Butter Fudge
For chocolate peanut butter fudge with marshmallow fluff, stir in 1 cup of semi-sweet chocolate chips along with the peanut butter, or swirl 1/2 cup melted chocolate over the top just before the fudge sets for a marbled look.
3-Ingredient Marshmallow Fluff Peanut Butter Fudge
For a genuinely simple 3 ingredient marshmallow fluff peanut butter fudge, skip the stovetop step entirely: microwave 1 1/2 cups peanut butter chips with 1 cup peanut butter until smooth, then fold in the full jar of marshmallow fluff. Spread into a lined pan and chill until firm.
Common Mistakes to Avoid
- Using sweetened condensed milk instead of evaporated milk in the stovetop version — they are not interchangeable and will change the result completely.
- Using natural-style peanut butter — the oil separation prevents the fudge from setting properly.
- Walking away during the boil — this fudge moves fast, and unattended sugar can scorch or crystallize in seconds.
- Refrigerating the finished stovetop fudge — cold, dry air makes it crumbly. Store it at room temperature instead (see Storage below).
What to Serve With Peanut Butter Fudge
- A cold glass of milk, for dunking
- Alongside other candies on a holiday gift plate
- Crumbled over vanilla ice cream
- Packed in an airtight tin as a homemade gift
Storage
Store this peanut butter fudge with marshmallow fluff at room temperature, tightly wrapped or in an airtight container, for up to 2 weeks — the high sugar content acts as a natural preservative. Do not refrigerate the stovetop version, as cold air dries it out and makes it crumbly. To freeze, wrap the whole block (not individual pieces) tightly in plastic wrap, then foil, and freeze for up to 3 months. Thaw at room temperature before slicing.
Nutrition (per piece)
| Nutrient | Amount |
| Calories | 108 kcal |
| Carbohydrates | 12g |
| Protein | 2g |
| Fat | 6g |
| Saturated Fat | 2g |
| Sugar | 10g |
Nutrition values are estimates and will vary based on exact ingredients and slice size.
Frequently Asked Questions
Can I use marshmallows instead of marshmallow fluff?
Yes, though it’s not ideal — regular marshmallows are coated in cornstarch, which can slightly dry out the finished fudge. See the Fluff vs. Creme vs. Regular Marshmallows table above for the details.
Why did my peanut butter and marshmallow fluff fudge turn out grainy?
Undissolved sugar is the most common cause. Make sure every sugar granule has dissolved before the mixture reaches a boil, and avoid letting sugar crystals sit on the sides of the pan.
Can I make this peanut butter fudge with marshmallow creme instead of fluff?
Yes — marshmallow fluff and marshmallow creme are essentially the same product under different regional names, and either works identically in this recipe.
How long does peanut butter fudge with marshmallow fluff last?
Up to 2 weeks at room temperature in an airtight container. See the Storage section above for freezing instructions if you want it to last longer.
Do I need a candy thermometer to make this fudge?
No — a candy thermometer makes it more foolproof, but the timed-boil method in this recipe works reliably without one. See the doneness guide above for all three testing options.
Related Recipes
Peanut Butter Fudge with Marshmallow Fluff
Ingredients
Equipment
Method
- Line an 8×8-inch pan with parchment paper.
- Melt butter in a heavy saucepan over medium heat, greasing the sides.
- Add evaporated milk, then sugar and salt. Stir until fully dissolved.
- Bring to a full rolling boil, stirring constantly, for 3-5 minutes.
- Remove from heat. Stir in marshmallow fluff, peanut butter, and vanilla until smooth.
- Pour immediately into the prepared pan and smooth into an even layer.
- Cool at room temperature for at least 2 hours until fully set.
- Lift out using the parchment overhang and slice into 1-inch squares.
Notes
This recipe is intended for general home cooking guidance. Boiling sugar reaches extremely high temperatures — use caution, keep children away from the stove during this step, and never leave the mixture unattended while it boils.
Jonas Mitchell is a home baker and recipe developer at RecipeValley, focused on approachable, kitchen-tested desserts and everyday recipes. He does not hold a clinical nutrition credential, and his content is for informational purposes only and is not a substitute for advice from a doctor or registered dietitian.
