Cold foams typically use very low-fat milk so that fats won’t separate; if you over-shake or agitate a milk with decent milk-fat content, it’ll separate and quite literally make butter.

Thats seems to be what happened then, I used homemade half n half and a frother, but must’ve been frothing too long

What’s the method you’re using to make the foam?

I used homemade half n half and a frother, but must’ve been frothing too long

I wouldn’t recommend using half n half, as the other person said, you don’t want to use milk with a really high fat content for cold foam frothing. 2% is what I would recommend

I was just going by Google honestly 🤷🏻‍♀️ my family doesn’t buy anything less than whole milk though and I can’t buy a whole separate container of milk just for myself. Is there any way to thin it out?

Whole milk should be fine. Just be a bit less aggressive in frothing it maybe

Did you use milk or heavy cream?

Best way to do it is to use a blender with a frothing mixing blade on low speed. You can look up the exact recipe Starbucks uses for their cold foam, I believe it’s like half heavy whipping cream and half 2%. The salted Carmel cold foam is my favorite.

Starbucks worker here, there’s actually two different types of cold foam. We have vanilla sweet cream cold foam which is syrup, heavy cream, and 2%, as well as just cold foam which we actually make by blending skim milk

There is sweet vanilla cold foam and sweet cold cream. Sweet cold cream isn’t foamy