falafel sandwiches -- you can buy a mix, they're economical too. Make the falafel patties and serve just like gyro sandwiches
vegetable soup -- these can be very hearty, and it's getting to be soup season. Start with a good veg broth and add whatever you like, or have: carrot, onion, celery, bell pepper, zuchinni, pumpkin, potatoes, beans, pasta, rice... serve with a good bread
vegetable sushi: not as hard to make as you might think. Vegetable strips on rice, rolled in nori. You can get instructions on youtube. Serve with some egg drop soup for a filling meal.
bean and cheese burritos, cheese quesadillas, both good with a nice salad
lentil stew: another good hearty winter dish, start with a good broth and add lots of root vegetables. If you're not going vegetarian, it is better with a little chopped kielbasa or crumbled sausage (a little goes a long way here)
egg salad sandwiches - an oldie but a goodie
grilled cheese with tomato soup -- ditto
peanut butter and jelly/banana/fluff -- ditto
pancakes or waffles with fruit (aka 'breakfast for dinner')