I tweaked my Ultra Slimfast "instant breakfast" to make it lower carb:
I use 1 Tbs. of the Ultra Slimfast powder (Chocolate Royale) and 1 tsp. of unsweetened Hershey's cocoa. There is more than enough sugar in the Slimfast to sweeten the cocoa.
Each regular scoop (3 Tbs.) of Ultra Slimfast powder is 24 carbs, so this cuts it to 8, plus 1 carb for the cocoa. Plus 12 carbs for the 2% milk. 21 carbs total. Not good, I know, but better than the 36 carbs in the original.
Now I know the strict Atkins dieters will be violently opposed, but I've been eating "instant breakfast" for almost 40 years and was not willing to give them up when I started Atkins. I am not a morning person and don't want to face any decisions when I get up. I don't like eggs or other breakfast food, for that matter (Luckily, I never liked cold cereal, hot cereal, pancakes, biscuits, Danish, etc.) When I started Atkins, I decided that it would be for the long haul, and if I was going to stick with it, it had to be a diet I could live with indefinitely. It works for me.