In a large skillet set over medium heat, add the ground turkey or chicken. Cook for approximately 5-7 minutes, using a wooden spoon to break the meat into small pieces as it browns.
Once the meat is no longer pink, add the diced onion and minced garlic to the skillet. Sauté for 3-4 minutes, or until the onion becomes translucent and fragrant.
Stir in the diced bell pepper, crushed tomatoes, tomato paste, Italian seasoning, and dried oregano. Season this mixture with salt and pepper to your liking. Let it simmer for about 10 minutes, stirring occasionally until the sauce thickens slightly.
While the sauce simmers, prepare the zucchini slices. Lay them out on a clean kitchen towel and sprinkle lightly with salt. Allow them to sit for 10 minutes to draw out excess moisture. Afterward, gently pat the slices dry with the towel.
Lightly grease a 9x13 inch casserole dish with cooking spray or oil. Start by layering half of the zucchini slices on the bottom of the dish.
Next, pour half of the cooked meat sauce over the zucchini layer, followed by half of the shredded mozzarella and grated Parmesan cheese.
Repeat the layering process with the remaining zucchini, meat sauce, and cheeses.
Cover the casserole dish tightly with aluminum foil to prevent the cheese from burning. Bake in the preheated oven for 30 minutes.
After 30 minutes, carefully remove the foil and bake for an additional 15 minutes, or until the cheese is bubbly and has turned a delicious golden brown color.
Once baked, remove the casserole from the oven and allow it to rest for about 5-10 minutes. If desired, garnish with fresh basil leaves before serving for an added touch of flavor and freshness.
Notes
Serve individual portions garnished with fresh basil and a side salad for a complete meal.