A milk frother is probably one of the easiest, fastest products to prep cold foam to get that Starbucks copycat consistency.
An immersion blender can do everything a milk frother will. Some models have a lot of power, so be sure to start frothing on low power and increasing as the foam builds.
If you’re a minimalist with muscles, then a mason jar is a great way to prep cold foam. The first step is to, add milk to your glass, then add a lid, then get to shaking!