Protein Cold Foam

Name: Protein Cold Foam
Prep time: 5 min
Total time: 5 min
Yield: 3 servings. 2.0 L
Cuisine: international
Ingredients: 170.0 ml Cold Skim Milk; 35.0 g Chocolate Protein Powder; 690.0 ml Brewed Coffee

Light milk foam with protein powder for brewed coffee.

5 minEasyDrinkVegetarian

This Protein Cold Foam combines skim milk and protein powder into a creamy topping for coffee. Preparation takes five minutes. The creamy topping pairs with cold brew, filter coffee, or iced coffee.

What sets this recipe apart from an ordinary milk frother: the Vitamix Aer Disc container whips rather than blends — its rotating perforated disc draws liquid through the openings and incorporates air in the process. The result is a stable, dense cold foam that a stick blender or handheld frother cannot achieve in this consistency. At the same time, the protein powder is incorporated without lumps, without turning into a blended paste.

Instructions

1
Add milk and protein powder to the Aer Disc container in the order listed and secure the lid.
2
Start the blender at the lowest speed, then ramp to Variable 6. Blend for 15 seconds.
3
Pour the foam over hot or cold coffee.

Chef's Note

You can customize the drink with your preferred syrups. Other milk types will change the foam consistency.

Why the Aer Disc container: for this recipe, the Vitamix Aer Disc container is the right tool — not the standard blade container. The disc aerates and emulsifies rather than blends: skim milk becomes a stable foam structure, and the protein powder incorporates evenly without clumping or pureeing. Important: the disc must be submerged in the liquid — at least ½ cup (approx. 120 ml) is the minimum for stable foam.

Technique: always start on the lowest speed, then ramp up to Variable 6 — this speed ramp builds the foam evenly without the disc tearing out the air already incorporated. 15 seconds is sufficient; blending longer does not produce denser foam but risks over-whipping.

Nutrition per 100 ml

Energy	22 kcal92 kJ
Fat	0.1 g
Carbohydrates	2.1 g
of which sugars	1.3 g
Protein	3.1 g
Salt	0.31 g

Values per EU FIC Regulation (1169/2011). Values are averages and may vary depending on ingredients and preparation.

Frequently Asked Questions

Which Vitamix container do I need for Cold Foam?

For this recipe you need the Vitamix Aer Disc container. It replaces the blades with a rotating perforated disc that whips air into the milk instead of chopping it. The standard container with blades would purée the milk but would not create a stable foam.

Can I use other types of milk?

Yes — skim milk foams especially well, because a higher protein content stabilizes the foam structure. Oat milk, almond milk, and soy milk also work, but produce a slightly lighter or less stable foam structure. Whole cow's milk foams very creamy, but with less volume.

Which protein powder is suitable for Cold Foam?

Whey protein and casein foam most reliably, because they stabilize the foam structure much like milk protein. Vegan protein powders (pea, rice) also work, but can change the consistency of the foam somewhat. The powder should be fully dissolved — no premixing before blending is needed, the Aer Disc takes care of that.

Can I make the Cold Foam ahead of time?

Cold Foam is creamiest when served fresh. You can keep it in the refrigerator for up to 10 minutes — after that the foam structure starts to collapse. Before serving, shake it briefly or foam it again for 5 to 10 seconds.

Why isn't my foam firm enough?

The most common reason is too little liquid: the Aer Disc has to be fully covered by the milk — at least 120 ml. The second reason is too high a speed from the start. Always start on the lowest setting and only then increase to Variable 6, so the foam structure builds up evenly.