I often drink twelve ounces of the following for breakfast (recipe adapted from Adele Davis--old-school health nut):
Blend together 2 cups milk, 1/2 cup powdered milk, 1 tablespoon to 1/2 cup brewer's yeast (increase the amount as you get used to it), 1 egg (shell and all), 1/4 cup flax seed meal, 1 teaspoon vanilla, 1-2 tablespoons lecithin, 1/2 frozen orange juice concentrate. Then add 2 more cups of milk and blend again.
I like the way this tastes, but many wouldn't. It's full of protein, though, so perhaps you'll want to give it a try.