Protein Hot Chocolate

Protein powder and hot liquid are natural enemies. Whey begins denaturing around 140F, which is why dumping a scoop into hot cocoa gives you grainy curds floating in brown water. The fix is a cold slurry, gentle heat, and a little patience. Casein handles the heat far better than whey if you have a choice.

Ingredients

• 1 cup whole milk, divided
• 1 scoop (32 g) chocolate casein or whey-casein blend protein powder
• 1 tablespoon Dutch-process cocoa powder
• 1 tablespoon maple syrup
• 1/2 ounce dark chocolate (70%), chopped
• 1/4 teaspoon vanilla extract
• 1 pinch fine sea salt

Instructions

1. Measure out 1/4 cup of the milk and keep it cold. Whisk the cocoa powder, maple syrup, and salt into 2 tablespoons of that cold milk in the bottom of your mug until it is a smooth paste, since cocoa clumps in hot liquid exactly the way protein does.
2. In a separate cup, stir the protein powder into the remaining 2 tablespoons of cold milk until it is a lump-free slurry, adding a teaspoon more milk if it will not loosen.
3. Heat the other 3/4 cup of milk with the chopped dark chocolate in a small saucepan over medium-low, whisking, until the chocolate melts and the milk steams but never simmers, about 4 minutes, or 150F on a thermometer.
4. Pour the hot milk into the mug with the cocoa paste and whisk smooth, then let it stand 2 minutes to fall below 140F before anything else goes in.
5. Whisk in the protein slurry in a thin steady stream, add the vanilla, and drink right away. Do not reheat it, which curdles the protein. Refrigerate any leftover and drink it cold within a day.

Tips

• 140F is the number that matters. Above it, whey unfolds and clumps into curds no whisk will fix. Without an instant-read thermometer, cocoa you can hold a fingertip in for three seconds is about right.
• Micellar casein handles heat far better than whey and thickens as it cools, so a casein or blend powder makes a noticeably better hot chocolate. Straight whey isolate is the worst possible choice here.
• For peppermint, add 1/8 teaspoon of extract and no more, since it takes over fast. For a Mexican style version, whisk 1/4 teaspoon of cinnamon and a pinch of cayenne in with the cocoa.

FAQ

Can I just stir protein powder into hot chocolate?

No. The powder hits hot liquid, the protein denatures on contact, and you get grainy specks throughout. Always make a cold slurry and add it to cocoa that has already dropped below 140F.

Which protein powder works best in hot drinks?

Casein first, then a whey-casein blend, then collagen. Straight whey isolate is the most heat sensitive and the most likely to curdle on you.

Can I make this in the microwave?

Yes. Heat the milk and chocolate in 30 second bursts, stirring between each, and stop while it is steaming rather than bubbling. Microwaves overshoot fast, and overshooting is what ruins the protein.

How do I make it dairy free?

Use unsweetened oat milk, which is the closest plant milk to whole milk for body, plus a pea and rice protein blend. Plant proteins are more heat tolerant than whey, but still slurry them first.

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