What I finally figured our was that I couldn't keep them full because they really needed the calories during those growing years from about 13 to 17. You can't fill teenagers up at dinner no matter what you serve--they really are hungry an hour later. Okay a half-hour later.
When I froze pancakes, I made them from scratch and put all sorts of stuff in like oatmeal, cornmeal, wholewheat flour. The point was to make them heavy and filling. They would microwave them and eat with butter and jam or syrup.
They'd eat biscuits and gravy. I made gravy and froze it in margarine tubs. Good luck.

Here was one recipe we loved, which freezes well, is easy to reheat, and was well tailored to the portions at Costco...Quesadillas (similar to fajitas):
1 large bag of grated cheese (about 5 lbs for $11!)
20-30 tortillas
any combo of pre-cooked veggies or meat

We went vegetarian, using onions, mushrooms and peppers--but try spinach, zucchini, chicken, anything that's on sale! Even just plain cheese works. Fill the tortillas with the stuff. Fold them in half (omelette-style). Then, stack them and put them in a bag and freeze (I put saran wrap between each one to keep them from sticking together, but it may not have been necessary). To cook, just grill, fry, or toaster-oven them (I like to thaw them, then toaster-oven for 10-15 minutes). Microwave probably works too. We bought a big-sized container of salsa to go with it, and some sour cream.

These are soooooo yummy, I promise your kids will love them.
Total servings: 20-30
Total cost (at Costco's): $20-$30, including veggies & salsa