having stayed with DD and her 4 kids for a few weeks, my observations
taco bar with toppings, make your own, they all help chopping and preparing the toppings and oldest (14) can now do the meat.
baked potato bar, ditto, this usually goes with a dessert that has some additional fruit in it
quesadillas, they got a machine that makes them the eat them so much, they also make filled pizzas (actually more like calzones, but the bread not as thick), it takes the large flour tortillas.
she buys the already made pizza crusts and they make their own pizzas since they have such differing tastes
they do grill a lot, she buys from schwanns (the truck pulls into the garage and loads her freezer every other week) so they get the frozen beef patties, chicken breasts etc.
they do a lot of pasta, varied by using different shapes and coming up with crazy names for them, but again only one likes tomato sauce, the rest all like different things–grated cheese, bacon and diced pepperoni with butter, chopped veggies
they also got pie irons (DD is a girls scout leader) and make those over the grille, just bread, with sandwich or pizza style filling
her idea is to get them involved in planning and fixing meals so maybe they eat more and better.
she also uses her huge crock pot a lot
she made a big beef roast one day, served with potatoes, gravy, veggies etc.
the next day, she pulled the meat for BBQ on buns with chips and salad
that meat went into tacos, and “instant pot pie”–mix a bag of frozen mixed veggies with canned gravy in a casserole dish, add the meat, top with instant mashed potatoes and bake.
they also eat a lot of chicken, little girls eat nugget type exclusively