Frozen chicken (grilled strips are ideal), shrimp (peeled are ideal) and veggies go a long way to speeding up the process. Cans of cream soup combined with cream cheese are a good sauce base.
Mac and cheese with rotel and chicken (canned chicken would do). One box mac and cheese + one can of rotel + chicken to taste – upsize as needed.
Alfredo – imitation crab/chicken/ham chunks/pepperoni, alfredo sauce, fettuccine noodles. Add bread and/or salad if wanted.
Mushroom chicken with noodles – chicken, can of cream soup (mushroom ideal), white wine, cream cheese (onion and chive adds flavor), mushrooms (canned is fine but I prefer sautéing fresh), noodles. Heat and blend one can of cream of soup with half a tub of cream cheese (whipped is easier to blend). Add white wine, thinning until you have the consistency you like. Add chicken and mushrooms; heat through. Serve over noodles (extra wide egg noodles are good).
Versions of tostados - nachos, taco bowls, crunchy tacos, burritos, soft tacos (corn, flour). To stretch the main we rely on sides of canned beans (personal favorites jalapeno black beans, jalapeno black eyed peas and boracho beans) and a side of Spanish rice. I make the rice from scratch (dry rice, one can of rotel, chicken bouillon to taste, water as needed) but there are plenty of boxed/bagged rice options.
Quesadillas - shredded cheese, refried beans, chicken (again canned will do; try canned shrimp if you like). Serve with sour cream, guacamole, salsa, etc. Again adding bean sides and rice is my staple for this meal.
Quick pot pie –chicken/beef/turkey chunks, veggies of choice (fresh or frozen), can of cream soup of choice. I will debone a grocery store chicken or turkey and then add frozen veggies, heating all of it to thaw veggies and heat through. Then add the cream of soup (one can or two to get all of it saucy to my liking), thinning with wine or chicken broth. Heat through. Transfer to an over safe dish and add a topping (canned biscuits/phyllo dough/pizza dough OR bread crumbs mixed with shredded cheese (parmesan typically)). Bake to cook topping OR crunch up the bread crumbs.
Salads – the sky is the limit here. I use whatever greens make me happy and then add everything and the kitchen sink. Hard boiled eggs, chicken/tuna fish/shrimp/anchovies (canned options galore), artichoke hearts, pickles, pickled veggies, fresh veggies, croutons/tortilla chip strips/tortilla strips, cheeses, canned/drained beans... Varying the dressing makes it different as does varying what you put on the greens. I will make a wet salad (crab salad, tuna salad, chicken salad, egg salad) to top the greens too.