I agree that fats help a lot. Nut butters really do the trick for me.
I also need VOLUME in my food to fill up my stomach, and I mainly get the volume from veggies! Salads with hearty ingredients (broccoli, cabbage, carrots in addition to the standard greens) help a lot. For dinner, I make a lot of stir frys, soups, chilis, and pasta dishes. But whatever recipe I am using, I always add in extra veggies and often replace some of the meat or pasta with beans, so that it is more healthful and filling. (Costco, grocery store sales, and Farmer's Markets help keep the price down on the veggies, thank goodness.)