Basically, I only have it in me to cook breakfast every other day.
I make whole wheat pancakes or french toast a couple times a week, and always make lots of extra so we can warm it up the next day. I usually serve it with a protein/fruit/veggie, like scrambled eggs & spinach, or greek yogurt & fruit the day after. I sometimes make a veggie & cheese quiche and that lasts a couple D. as well.
For lunch we do bento boxes, and those are mostly no cook or leftovers. Pinterest gives neat ideas but my kids are usually happiest with simple stuff (cheese cubes, dried fruit or veggie slices, hummus, granola/crackers, cut up meat or hard boiled eggs). My toddler snacks on similar stuff throughout the day too.
My 5-year-old can make her box, and my toddler is starting as well. They have a shelf in the fridge that is all cut up veggies/fruits, single serve yogurts, cut up meat, milk boxes, and cheese. They have another shelf in the pantry with crackers, cereal, dried fruit, peanut butter single serve containers, and whatnot. She loves that independence.
You didn't ask, but for dinner I cook what I want or what my husband requests, and my kids have to go along with it. I tend to like Indian food and my Dh loves Mexican food so we eat those flavor profiles a lot. It's good for their little palettes to experiment and then I don't get bored!
ETA: I have a friend who made me homemade 'boxes' (tupperware) or frozen waffles and pancakes when my son was born. They warmed up wonderfully in the toaster oven.