01 -
Preheat oven to 190°C and lightly grease a 23x33 cm baking dish.
02 -
In a skillet over medium heat, cook ground beef with diced onion and minced garlic until beef is browned and onions are translucent. Drain excess fat.
03 -
In a large bowl, mix the cooked beef mixture with half of the shredded mozzarella, half of the grated Parmesan, zucchini slices, marinara sauce, Italian seasoning, paprika, and red pepper flakes until evenly combined.
04 -
Transfer mixture into prepared baking dish, spreading evenly. Top with remaining mozzarella and Parmesan cheeses.
05 -
Bake for 25–30 minutes, or until the cheese topping is bubbling and golden brown.
06 -
Let the casserole rest for 5–10 minutes before slicing and serving.