It depends on what I'm trying to accomplish. Right now I'm trying to cut some weight, so I cut all the carbs out of my diet. My breakfast now consists of a casein protein drink (casein because I am essentially doing a keto type of diet, and whey has been known to knock people out of ketosis), 4 large egg whites, and some cheese. I only drink water.

Under normal circumstances, I take whey protein, liquid egg whites, and oatmeal, throw it in the blender with water, and that's my breakfast.