I eat an omelet with 2 whole eggs, an egg white, and mushrooms (or green pepper, or zuchinni, or whatever other vegie I have in the frig). The combination of protein, fat and low-glycemic carbs keeps me satisfied IFF I have been doing it for at least a week and preferably two. The first week or so my body is unhappy and sends hunger-craving signals because it wants and expects the combination of fat and simple carbs that it was getting before. For snacks I eat string cheese and celery, or almonds, or (later in the day) good olives and marinated mushrooms.
Hang in there! It takes a while for your body to get used to your new, healthy, habits. it will get easier!