Paleo lasagna recipe calls for eggplant - we alternated layers of eggplant and zucchini. for the sauce, we used Trader Joe's Marinara. Sauteed some onion/pepper then dumped the marinara on top and heated.
Quick dinner idea: Meatball Sandwich Casserole | Ordering Disorder | Work It, Mom! (Edit: Used Italian loaf bread, Italian cheese (and moz), put bread all over, not just on bottom (got too soggy there), Italian sausage pasta sauce, chopped sweet peppers.)