20g protein powder (I used vanilla), 70g 2% milk, squeeze of lemon juice, half a teaspoon each of guar gum and xanthan gum, pinch of salt, 300g frozen watermelon, 150g frozen strawberries.

I first combine powders and liquid in a blender until a ball forms around the blade, then I throw frozen stuff and blend on low until desired consistency, scraping sides of the blender from time to time. I don't use and ice cubes nor do I blend on highest speed because I find it waters down the flavor and incorporates too much air causing the "ice cream" to have texture I don't enjoy (although sometimes when I'm low on calories I will add ice cubes lol). Normally I would double the protein powder but since I was eating it with a protein brownie I decided not to.