What milk works best for cold foam?
For a great balance of thickness, stability, and creaminess, use cold 2% milk or whole milk. If you want it extra plush, add a little heavy cream. Skim/nonfat milk can whip up with lots of volume, but it tends to feel lighter and less creamy, and the foam can break down faster.
Can I make this dairy free?
Yes. Use barista-style oat milk or a foaming almond milk. The barista versions are formulated to foam better and hold longer. Keep everything very cold for best results.
Why is my foam not thick?
Common culprits: your milk was not cold, your sweetener and spices were not well mixed, or you used a milk that does not foam easily. Try chilling the mixture for 10 minutes, then froth again. Also, a tiny pinch of salt can tighten the flavor and make sweetness pop.
Can I use ground spices, or do I need a syrup?
You can use ground spices. The trick is to mix them into the sweetener first so they disperse and do not clump. Cinnamon and nutmeg will not fully dissolve (you will see specks), but they will blend in smoothly. If you want a perfectly smooth foam with no specks, use a cinnamon syrup or strain the mixture before frothing.
Does sweetener choice matter?
A little, yes. Maple syrup and honey are delicious, but they can be slower to blend into very cold milk. If you want ultra-smooth foam, use simple syrup, superfine sugar dissolved in a teaspoon of warm water, or warm your maple syrup for a few seconds (then mix it with the spices before adding to the cold milk).
Is this “wholesome” as in low sugar?
It is lightly sweet and easy to adjust. Start with 1 teaspoon of maple syrup and scale up only if you want it more dessert-like. Also note: adding heavy cream makes the foam thicker, but it does bump up the richness (and calories).