Not taking the time to read all of the replies, but here are a few suggestions. Sorry if they are duplicates of what others have said. BTW, we have a poultry allergy here in the house, so I use a LOT of pork loin in place of chicken in lots of recipes.
CROCKPOT!! My best friend! Yes, you still need to do some prep work usually.... but WOW...you can create SO MANY great foods in a crockpot! Stews, soups, casseroles, even whole meals like meatloaf and baked potatoes! Some of my easy "go-to" crockpot meals that require very little prep (like maybe 15 minutes or less)......
pulled pork (I avoid all of those recipe that call for cooking the meat in root beer or coke).... cook a fairly lean pork loin all day with (or without) some sliced onions and then shred at the end of the day and top with a store--bought (or homemade) BBQ sauce..... serve on wraps, rolls, or even lettuce leaves. Side of broccoli or some pre-washed salad greens and you are done! Could do the same with beef or chicken.
Pot roast..... yes, it is BETTER if you can brown the meat first, but it isn't a total loss if you can't/don't have the time. Put the roast into the crockpot and surround with baby carrots, small potatoes (anything you DON'T have to peel and cut if you want to make it easier), onions, parsnips, celery.... whatever you want. Put in about a cup or so of beef stock and let it cook all day... DONE!
Creamy southwest pork (or chicken) and black beans........put a lean pork loin into the crockpot and cover with a jar or two of your favorite savory salsa (or even a can of diced tomatoes works). Let it cook all day until you can shred the meat. After you shred the meat, toss in a can or cup (or two) of beans (I prefer black but kidney, pinto, or white work well too) and about a half a brick of cream cheese (most of the time when I see this recipe it calls for a whole brick, but I find that to be too much) and stir around until the beans are warm and the cheese is melted throughout. Serve in tacos, on tortillas, on bulky rolls, over rice or just in a bowl! We like onion a lot here, so I usually slice up a large sweet onion and put that in at the beginning too. We watch our carbs here, so often this is served plain or over a hot veggie like sauteed greens or steamed cauliflower.... but it is great over rice and DS likes to top it with tortilla chips.
Other ideas that don't involve crockpot........
frozen veggie burgers..... you should be able to find a flavor that your family likes (my men like the MorningStar Farms tomato basil pizza burger best).... easy to leave in the freezer for emergencies..... serve as a burger on a roll.... or chopped up in a wrap or in a taco shell. Easy to cook on the grill (no pot to wash!), or in a skillet on the stove..... serve with a green side of some variety and you are done! Maybe add a frozen potato option (french fries maybe) and you are done! Somehow "burgers" for dinner seem fancier than just sandwiches, even though they are essentially just a hot sandwich!
Eggs..... SO quick and easy.... you can throw together a frittata or quiche super quick (although they take about 30 minutes to actually cook) and serve with toast or corn bread and a small salad.
"Refrigerator" wraps..... I dig around in the fridge and pull out whatever we have available.... a bit of chicken, some greens, some cooked broccoli from a previous meal, maybe a bit of cheese, a hunk of meatloaf...........put together individual wraps or tortillas with something to bind it together. For cold wraps I like a shmear of hummus or even a bit of light cream cheese..... for wraps that I will grill or cook in a skillet (like a quesidilla) I prefer shredded cheese. I can use up leftovers and customize a wrap to everyone's liking! It tends to create more dishes because I end up with more tupperwares to wash, but other than that it is a one-pot night. I usually serve fruit as a side.
Hope this helps.................P