when my kids were that little I didn't worry too much about it, honestly. We were just trying to survive. But, here are a few things at that age that I recall and that we still do.
Dh and I would make a pasta at least twice weekly with (for us) sauteed broccoli, garlic, red pepper, chick peas and olive oil/cheese. I'd separate out steamed broccoli before sauteeing and kids would have pasta,broccoli and smashed chick peas. sometimes adding chicken or shrimp too.
Tacos--yes, they are your friend. We still do this and I buy the pouches of rick bayliss sauces, Throw whatever (ground turkey, chicken breast, pork) into the slow cooker or instant pot in the am.If I'm doing fish or shrimp its last minute. PM make rice, black beans and put out cheese. We put this on the table with condiments (salsa or yogurt/sour cream). Everyone makes what they want out of it, and I eat leftovers for lunch with choppped lettuce.
Pork loin or roast: we buy these premarinated from TJs and cook as directed for night one, then I throw in crockpot for night two as tacos (see above)
there's a place near us that has terrific marinated steak so we do that once a week with roasted veggies (throw it all in the oven).
I do a crispy chicken--dip chicken breasts in beaten egg and then a mix of breadcrumbs, parmesan, garlic salt and paprika, sautee and serve with rice or pasta or bread and veggies. This also works for any kind of white fish.
rice bowls: marinate and cook chicken thighs, drumsticks in bottled teriyaki ssauce, serve on rice with chopped cucumber, green onion, sesame seeds, soy sauce.
toss hotbow tie or other shape pasta in a sauce of torn basil, garlic, olive oil cherry tomatoes and fresh mozzarella balls.
curry anything: buy coconut milk and jarred curry paste (not spicy for kids, I use only a little), follow instructions on back to make a protein or tofu and veggie curry. We do tofu, and any mixture of what we have around.
Chicken tortilla soup:great for leftover rotisserie chicken (another one of our staples--we pick up chicken, baguette and make a big salad). Sautee onion, garlic, a bit of chili powder, add chicken and a can of tomatoes and some chicken broth and a can of corn, simmer for a while andthen top with tortilla chips, lime wedges, sour cream etc. Lots of varied recipes for this online.
veggies my kids are8 and 10 and they still like to nibble from a raw veggie plate--peppers carrots celery cucumbers, etc. I wished they liked hummus more, because that with hummus and crackers is a great lunch too.