How to GAIN weight - any lo-carb weight gain powder?

I slowly started dropping weight when I started intensive insulin therapy. This is probably due to paying closer attention to what I eat and exercising a little more, who knows. I am not a follower of low carb, rather I just try to eat whole food, healthy, balanced meals.
Back to the point, I drink Muscle Milk powder most mornings with a scoop of Barlean's Greens in it. It's only 18g of Carbs for 310 calories. I get it from Costco in the 4lb bag. I like it because it allows me to eat something along with it without having to take a large bolus.
Be aware that all of the protein powders have pretty fast acting carbs so you may want to pre-bolus a bit before drinking them.