D.B.
Are we talking about a family, maybe with some kids (and the oldest is 17)? Are there picky eaters? Doing your own cooking is cheaper, and actually doesn't take a lot more time than stopping for prepared food by the time you add in the driving, waiting, etc.
Everyone can help, first of all. If you are working 40 hours, doing laundry, doing the food shopping and meal planning, something's wrong. Start delegating.
Take 2 hours on the weekend for a family cook-fest. Everyone does something. Even little kids can scrub potatoes and rinse broccoli and green beans, peppers and lettuce, and put them in colanders to drain. Older kids can peel carrots and potatoes, cut things up, beat eggs, grate/chop cheese, and so on.
Select foods you like, and stretch a little with something new once a week. Every food you choose gets eaten twice during the week in different forms. For example, roast a chicken for one night, and strip the rest of the chicken off the bones for use in tacos, enchiladas or chicken soup or chicken salad. Roast potatoes with the chicken, or bake them alongside, but set a few aside for oven-fried potato spears another night. Serve steamed broccoli (cooks in 8 minutes) with the chicken and potatoes, but cut extra florets for use in stir fry or a family salad bar. Carrots, peppers, mushrooms, onions, celery can all go in stir fry or a salad bar. Rice can be a base for stir fry or a side dish for Mexican food, or both, and it freezes well or even keeps about 5 days in the fridge. Canned beans go in enchiladas, tacos or on top of salads. Sliced vegetables can go on a pizza.
If you make a salad bar with everything in different bowls, people can serve themselves. Add chickpeas or hardboiled eggs for protein, or leftover shredded chicken or sliced turkey.
Chicken tenders can be used to make healthy chicken fingers, and sliced up for use in stir fry. For tenders, beat an egg, dip the chicken in it, then roll in bread crumbs of a mix of wheat germ and flax seed, or add some crushed almonds (use the food processor) or some Parmesan cheese. Bake at 350 for about 15 minutes while you set the table or make a side dish of quinoa or couscous, and a big salad or a steamed veggie.
Oven fried veggies - better than fries! Cut a potato in wedges (white and red potatoes don't need to be peeled), or cut a sweet potato (or both), put on a baking sheet and drizzle with olive oil, a little salt and pepper, and add an herb you like, such as dill. Bake at 350 for about 20-25 minutes. If you want, peel an onion and cut it into 4 wedges, and throw that in. You can separate each wedge into a few chunks if you want, but if you stir during cooking, it will kind of happen anyway. You can add other veggies you like, including broccoli, cauliflower florets, green beans, asparagus, almost anything. Asparagus just takes 5-8 minutes, same with beans. Just throw them in part way through cooking, and stir to coat with oil. The leftovers can be reheated another day.
Make your own hamburgers with half beef, half turkey, and add veggies for flavor and moisture (onions, spinach) plus horseradish or worcestershire sauce for flavor, and flax seed and wheat germ for nutrition and fiber.
Rachael Ray and others have cookbooks and magazines along the lines of "cook for a week in one afternoon". There are also some cute things for kids to do, including making individual tortilla bowls in large muffin tins, adding pureed butternut squash to mac & cheese, and so on - look at Jessica Seinfeld's books especially for younger kids.
Easy enchiladas: open and drain a can of beans (black, kidney, pinto, or some of each) and a can of refried beans (regular or vegetarian). Cut up some green peppers and onions into small dice (cut some larger size strips or wedges for oven-roasted veggies for another night). Take out a handful of frozen pea and frozen corn (no need to defrost). Take some of the shredded chicken or extra hamburger/turkey that you've browned up. Have a pack of shredded cheddar or Mexican cheese, and a supply of whole wheat tortillas. Open a can of tomato puree, season it with pepper, coriander and cumin. Lay 2 tortillas side by side on a platter or large cutting board. Smear a strip of refried beans down the middle third of the tortilla, top with any/all of the above toppings, leaving off an item from one tortilla if someone doesn't eat it. The quantities don't matter. Fold up the two sides of the tortilla and secure with a toothpick. You can mark different people's tortillas with 2 toothpicks, or 1 turned in a different direction. Line the tortillas up next to each other on a lightly oiled baking sheet. You can cover and refrigerate this now and serve tomorrow. Bake at 350 for 20 minutes, topped with some of the sauce. You can add extra grated cheese for the last 5 minutes. Serve with rice, either plain or made with a little of the plain tomato sauce/puree instead of some of the water. Any leftover beans or sauce can be frozen for the next time you make this.
Tacos: most of the same ingredients, plus diced tomatoes and shredded lettuce. I don't love the hard taco shells because I think they break too easily, but you can use soft taco tortillas. I've seen pre-baked shells made in muffin tins too.
Stir fry - chicken or steak strips, marinated in a little soy sauce. One bowl of longer cooking veggies such as broccoli florets or carrots, another bowl of green or red pepper strips/chunks, onion strips or wedges, green beans, celery pieces; another bowl of quick cooking veggies such as snow peas and mushrooms, or some canned/drained sliced water chestnuts or bamboo shoots. You don't need all of them, and the quantities don't matter. If you like tofu, buy the firm kind, drain it well, cube it, and marinate it in soy sauce or tamari, drain and save the marinade. Heat oil (canola, or a mix of canola and sesame or peanut), and cook up the meat strips or the tofu until browned. Remove to a platter. Start with the veggies in sequence: 2 minutes for broccoli group, then add the peppers group for another 2 minutes (so you're up to 4 for the broccoli), then 2 minutes for the last batch. Stir gently to keep from sticking. Remove to the platter of with the meat or tofu. While this is all cooking, you take the reserved marinade or some extra soy sauce, a half cup or so of chicken or vegetable stock or water, 2 tablespoons of corn starch, mix so the cornstarch is dissolved and doesn't settle to the bottom of the pitcher or bowl, and dump into the pan. The cornstarch thickens the liquid while the water cooks down so you get a thick sauce. Takes about 2 minutes. Put all of the meat and veggies back in the pan and heat through. Serve over rice (which you either made as soon as you got home before you started the stir fry, or you made earlier in the week with chicken stock before you saved half for the enchiladas!).
Pizza - a variation on stir fry and salad bar, just put the stuff on the pizza with your own tomato sauce or something from a jar, and topped with grated mozzarella. Most supermarkets sell pizza dough (plain or whole wheat) with the prepared foods or near the deli counter - just spread it out on a pizza pan or a baking sheet, pre bake for 5 minutes while getting the toppings out, and then build the pizza. Add chopped spinach (frozen, from the bag) or other veggies, pepperoni, etc. - and everyone can have their own half a pizza if they don't eat the same things.
Crock pot - makes a million things, from soups to stews.
The main thing is, these recipes don't require precise quantities - you can try to relax about that!
Kids can make their own lunches.
Now, kids can cut and chop and sort. They can also put their laundry in the washer and turn it on and add soap. Big kids can fold, little kids can match socks and fold/stack underwear. They can do this while they are watching TV even. Maybe. If not, turn off the TV. Give every kid a hamper or a laundry basket in their closet, and make them responsible for their own stuff. If it's on the floor of their room or under their bed, it doesn't get washed. Period.
Let go of the house a little. Beds don't have to be made every day. Shut the doors if you have to, and have everyone work to pick up the public areas. Kids can set tables and clear dishes, empty trash and take out the recycling. My son was completely in charge of his own laundry by age 15 when he started serious sports - by the time he went to college, he was more than prepared. Start with aspects of it from a much earlier age.
You can also have a basket in the family room for all the junk that's not yours and is contributing to the mess. Anything not put away goes in there. If they want it, they find it. If you want baskets for each person, that's up to you, but in it go the stray shoe, the backpack, the lunch box, the textbook, the iPod, the used bath towel, and everything else. Nobody watches TV or uses a computer if there are wrappers or plates or food residue anywhere. Do not apologize for not doing everything. This is a family, not a bunch of bosses and one indentured servant (you). You are not being mean. You are raising accomplished, independent people who will be ready for adulthood.
Good luck!