Protein fluff is a light dessert made from protein powder, frozen fruit and a splash of liquid. You whisk it up in a few minutes to create a soft, mousse-like mixture. Below you’ll find the basic protein fluff recipe first, followed by five variations and answers to the questions people ask most often.
What is protein fluff?
Protein fluff is whipped protein powder mixed with frozen fruit and a small amount of liquid, blended together into a light, creamy mixture. The volume comes from air: by mixing it for long enough, you trap air bubbles in the semi-frozen mixture, causing it to expand.
The base is always the same: a protein powder that binds moisture, frozen fruit for structure and coldness, and just enough liquid to get the whole thing going. Casein is often used for this because it binds more moisture than whey, resulting in a firmer, thicker texture that retains its shape for longer.
How to make protein fluff? The basic recipe
For one portion, you’ll need:
- 150 grams of frozen fruit (e.g. strawberries, raspberries, mango or banana, chopped)
- 1 portion of protein powder: casein or a neutral protein powder (whey or plant-based). Follow the portion size indicated on the packet
- 60 to 100 ml of cold liquid (water, plant-based drink or milk)
- Optional: 2 to 3 ice cubes for extra volume
Here’s how to make it:
- Place the frozen fruit and half the liquid in a blender or tall jug and blend until you have a coarse, grainy mixture.
- Add the protein powder and blend again. Add the rest of the liquid a splash at a time, only as much as is needed to keep the mixture blending.
- Continue blending until the mixture visibly lightens in colour and expands. Allow two to four minutes, depending on your appliance.
- Spoon the fluff into a bowl or glass and top with fresh fruit, nuts, desiccated coconut or some cocoa nibs.
Important: the less liquid you use, the fluffier it will be. Too much liquid and you’ll end up with a shake. A hand blender with a narrow beaker often works better than a large blender jug, as the mixture stays close to the blades.
Why does the fruit need to be frozen?
You can’t make fluff with fresh fruit. Whipping only works if the mixture is half-frozen: the ice crystals make the mixture firm enough to trap air bubbles, just as cold whipped cream does. Fresh fruit doesn’t provide that structure, so the air you whip in escapes straight away and you’re left with a thin smoothie.
For the same reason, fluff works best when everything stays cold: use cold liquid, frozen fruit, and serve it straight away. If you leave it to stand, the crystals will melt and the mixture will collapse.
What are the 5 types of protein fluff you can make?
Using the basic recipe, you can vary it endlessly with different fruits, liquids and toppings. Here are five detailed recipes:
- Spring protein fluff with fresh fruit : frozen raspberries, strawberries and blueberries, topped with fresh fruit.
- Cherry chocolate fluff : frozen cherries and strawberries, finished with chocolate chips and fresh cherries.
- Chocolate protein fluff : frozen strawberries with cocoa powder and chocolate milk, finished with hazelnuts and cocoa nibs.
- Vanilla protein fluff : vanilla with frozen mango, topped with fruit.
- Casein protein fluff with mango and strawberry : frozen mango, topped with fresh strawberries.
More variations in the same style: casein protein fluff with blueberries and coconut, mango and coconut protein fluff, creamy strawberry protein fluff, protein fluff with raspberries and dark chocolate, and casein protein fluff with mango.
Fancy exploring more in this vein? Our protein-rich smoothie recipes include variations that you drink rather than eat with a spoon.
When does protein fluff fit into your day?
In practice, fluff is a dessert or snack: you eat it with a spoon, it’s cold, and it’s ready in the time it takes your blender to do its job. Many people make it after a workout or in the evening, simply because that’s a convenient time to get some extra protein.
Protein contributes to a growth in muscle mass. Protein contributes to the maintenance of muscle mass. How much you need each day depends on your weight and how much you exercise. If you want to work that out for yourself, our article ‘How much protein do you need per day?’ will help you get started. You can find out exactly how much protein your portion of fluff provides by checking the label on the powder you’re using.
Variations
These combinations work just as well with a scoop of protein powder:
- Vanilla with mango : mix frozen mango with a neutral or vanilla protein powder and a small splash of cold plant-based drink to create a light, yellow fluff.
- Creamy strawberry : use only frozen strawberries and keep the liquid content low for an extra creamy, thick fluff.
- Mango and strawberry : combine frozen mango and strawberry for a sweeter fluff and top with fresh fruit.
- Mango with coconut : blend frozen mango with a spoonful of desiccated coconut or a splash of coconut milk, and sprinkle extra desiccated coconut on top.
- Blueberries with coconut : frozen blueberries, combined with a little coconut, make a firm, deep purple fluff.
- Raspberries with dark chocolate : briefly blend frozen raspberries and top with grated dark chocolate or cocoa nibs.
- Cherries with chocolate : use frozen cherries with a little cocoa and top with chocolate pieces and a fresh cherry.
- Mixed red fruits : combine raspberries, strawberries and blueberries for a fresh, colourful fluff topped with fresh fruit.
Frequently asked questions about protein fluff
Why isn’t my fluff light and fluffy?
In most cases, this is due to too much liquid, not enough blending time or fruit that hasn’t been frozen. Start with a small amount of liquid and only add more if the blender starts to jam. Then blend for longer than you’d expect: the mixture should become visibly lighter in colour and increase in volume. If you’re using a blender with a wide jug, the mixture can sometimes end up too far from the blades; a narrow jug or a hand blender often solves this.
Which protein powder works best for fluff?
Casein gives the firmest result, as it binds more moisture and therefore forms a thicker mixture than whey. Whey also works, but produces a softer, quicker-setting texture that collapses sooner. You can read about how casein works and why it digests slowly in ‘What is casein? Slow-release protein explained’. If you want to know exactly what whey is and what it does, the article ‘Why whey protein and what does it do?’ explains it all. Choose a powder with a flavour that goes well with your fruit: a neutral powder is the most versatile, whilst vanilla or cocoa will already add a flavour of their own.
Can you make protein fluff vegan too?
Yes. A vegan (plant-based) protein powder works, though the texture is slightly grainier than with casein, as plant-based proteins bind moisture differently. In that case, use slightly less liquid, blend for an extra minute and include frozen banana or mango in the fruit mixture: these naturally give a creamy texture. Combine with a plant-based drink instead of milk.
How long does protein fluff keep?
Fluff should be eaten straight after making it. Within ten to fifteen minutes, the ice crystals melt and the airy texture collapses into a thick pudding. You can store it in the freezer for up to an hour, but it will become hard and you’ll need to leave it to stand for a while or give it a quick stir. Storing it in the fridge until the next day is pointless: the texture that makes the fluff so fluffy will have disappeared by then.
Which protein powder should you use for this?
For fluff, you need a powder that binds well and whose flavour you trust, as there’s little else in it apart from fruit and powder. In our protein powder range, you’ll find both whey and plant-based protein powders, as well as our organic plain casein, the powder used in most of these recipes. Each product lists the full ingredients and serving size, so you can work out for yourself exactly what’s going into your bowl.
