I'm going to sound really sad here but as a single mum & teacher I had a system which involved making a spreadsheet (I know, I know) with 3 weeks worth of meals planned on it with a balance of nutrition etc across each week and eg the use of a whole box of eggs across the week to reduce waste. Then I had a ready made shopping list (saving money) and never had to think and could prepare as much as possible in advance without getting sick of eating the same thing constantly. I had a summer version and a winter version too. Took a bit of preparation but worked for me :)
Also there's a lady on the net somewhere does slow cooker prep where you get "bags" of food ready on a Sunday and each day, freeze them, get them out the night before the slap the bag in the slow cooker before you go to work, delicious meal ready when you get home. Easy peasy.
Quick meals - quesadillas, one pot things like tomato sauce for pasta, pesto, omelettes, you can roast a chicken in a slow cooker all day on low (I do one for the cat each week!), fajitas, things rolled up in a pancake (cheese, ham, spinach, mushrooms), fried eggs, mushrooms on toast.
I'm veggie and often make a veggie bolognaise or smoky aubergine ragu and eat it for days - with pasta, next day with rice, next day on a potato or toast or in an omelette etc
Can you do big cook little cook and get the kids involved?