My kids love calzones - and they don't have tomato sauce in them like pizza, you usually serve it on the side. I make one with three cheeses (ricotta, mozzarella and parmesan) a container of thawed chopped spinach and some chopped ham. It also has dried basil, crushed fennel and sundried tomatoes (you could leave those out though). I use the bags of premade pizza dough from TJs and make little pouches with the filling. It's a great way to get spinach in your kids! Also they freeze really well, you can just pop them straight from frozen into the oven to bake. If you want the specific recipe you can find it on Cookinglight.com - it's called Ham Spinach and Sundried Tomato Calzones.
Another one to look up (also on cookinglight.com) that my kids absolutely love, that has no acidic ingredients in it, is Chiles Rellenos Casserole. I call it taco casserole for the kids - it has layers of green chiles, corn, ground turkey, cheese, refried beans and an eggy topping on it - it's delicious, healthy, really flavorful and appealing to adults, and kids love it.
There's a couple of ideas for you anyway!