Invest in a good, low carb protein powder! In these cases, the flavor doesn't matter too much as we're adding a whole bunch of goodies.
In a Nutribullet, combine all the dry ingredients and then add your wet ones.
You can choose your main liquid here.
Whether it's water, cream, coconut/almond/cashew milk, make sure it's low carb.
Even in innocent almond milk, some brands pump in a good amount of sugar.
Try to buy the unsweetened versions.
Add ice cubes for added thickness and blend for about a minute.
Enjoy cold!