Preheat the oven to 375° F, and grease a 9×13-inch baking dish.
Dice your onions.
1 small onion
Slice the zucchinis.
2 medium zucchinis
Cook the ground beef in a large skillet over medium heat until browned. Break the meat up as it cooks.
1 lb lean ground beef
Add the onion and the garlic. Continue cooking for a minute.
1 tsp garlic
Add the marinara sauce and the seasonings.
1 cup marinara sauce, 1 tsp Italian seasoning, 1 tsp salt, 1/2 tsp black pepper
Stir the beef mixture and then set aside for now.
Arrange the zucchini slices in rows inside the greased baking dish, with each slice slightly overlapping the other.
Pour the meat mixture on top of the zucchinis.
Sprinkle the top with mozzarella cheese.
1 ½ cups mozzarella cheese
Bake the dish, uncovered, in the oven for 20 minutes.
After baking, sprinkle the top with fresh parsley. Let the dish rest for 5 minutes before serving. Enjoy!
fresh parsley
Notes
Salt and Drain the Zucchini: To avoid making your casserole watery, you can salt the zucchini slices, let them sit for 15 minutes, then blot them with a paper towel to remove any excess moisture.
Always Opt for Lean Ground Beef: Using this kind of ground meat will let you have a rich-tasting casserole without it getting too oily or greasy, especially on top.
Bind If Needed: If you think the casserole feels too loose after cooking, add a binding agent. An egg or shredded cheese can help hold the dish together after baking.
Let It Rest: Giving the dish at least 5 minutes to rest before serving will let it firm up, making it easier to slice or scoop.
Don’t Skip the Herbs: A sprinkle of parsley will help brighten the dish. Fresh basil and thyme work well, too.