What’s great about parm is that’s pretty low in fat and has a junk-food-like ability to keep kids eating something, particularly healthy-ish dishes like these:
Blanket cherry tomatoes with the stuff and they go down faster.
Grate it over greens (romaine seems to go down easier than darker–i know, healthier–ones like red leaf) along with a light vinaigrette (salted slightly too) and they might actually eat their salad.
Shaved into a baby arugula (less peppery than the big stuff) salad along with a squeeze of lemon juice and a decent amount of olive oil is good too.
Along with some heirloom tomatoes and thyme, a ton of shaved slices of parmesan on top makes a great, not too super cheesy pizza (using premade pizza dough, or you can also set this up on bread run under a broiler).