I tried this recipe from AllRecipes.
I was looking for something that used zucchini and tomato, and had all the ingredients, minus the mozzarella. Unfortunately, it wasn't worth buying the mozzarella. It was bland. I added an extra tomato, as some suggested, and some tomato sauce. I also used bread crumbs in place of crackers and whole wheat noodles, but I don't think any of this accounted for the lack of flavor. Not a repeat.