Step 1: Whip the Egg Whites
In a stand mixer (or use a hand mixer + deep bowl), beat the egg whites and cream of tartar on medium speed until soft peaks form. This should take about 2–3 minutes. Let it sit while you prepare the syrup.
Step 2: Cook the Sugar Syrup
In a small saucepan, combine:
- Corn syrup
- Granulated sugar
- Water
- Salt
Stir just to mix, then bring to a boil over medium heat without stirring. Continue boiling until the mixture reaches 240°F (115°C) on a candy thermometer—this is the soft-ball stage. It will bubble and turn slightly glossy.
Don’t skip the thermometer—temperature is everything for that fluffy texture.
Step 3: Pour the Syrup into the Egg Whites
With the mixer running on low speed, slowly drizzle the hot syrup into the beaten egg whites in a thin stream. Once all the syrup is added, increase to high speed and beat for 6–8 minutes, or until the mixture is thick, glossy, and holds stiff peaks.
Step 4: Add Vanilla
Add the vanilla extract and beat for another 30 seconds to incorporate. The aroma at this stage is heavenly!
How to Store:
Transfer your marshmallow fluff to a glass jar or airtight container. Store in the fridge for up to 2 weeks.
Fluff will thicken slightly when chilled but stays perfectly spreadable. Let it sit at room temp for a few minutes if needed.
Use It On Everything:
- Slather on peanut butter toast for a fluffernutter sandwich
- Dollop into hot chocolate or coffee
- Spread between graham crackers + chocolate for instant s’mores
- Swirl into brownies, cupcakes, or fudge
- Layer in trifles or ice cream cakes
Tips for Success:
- Use fresh eggs for best volume and safety.
- Make sure the bowl and beaters are grease-free—egg whites don’t like oil.
- Want it extra stable for frosting or piping? Add 1 tbsp of powdered sugar while beating.
Final Thoughts:
This homemade creamy marshmallow fluff is the kind of treat that transforms any dessert from good to unforgettable. It’s cloud-like, sweet, and full of nostalgic magic—but with the rich, vanilla-scented warmth that only comes from homemade love.