1. Preheat the oven to 375°F (190°C). Grease a 9×13 baking dish and set aside.
2. In a skillet over medium heat, cook the ground turkey until browned, breaking it apart as it cooks. Let it sit a moment before stirring—browning builds flavor.
3. Add the chopped onion and minced garlic to the skillet. Cook for 2-3 minutes until the onion is softened.
4. Stir in the diced zucchini, diced tomatoes, oregano, basil, salt, and pepper. Cook for an additional 5 minutes until the zucchini just starts to soften.
5. Transfer the mixture to the prepared baking dish and spread evenly. Top with shredded mozzarella, then Parmesan.
6. Cover with foil and bake for 20 minutes. Remove foil and bake for another 10 minutes until the cheese is bubbly and golden.
7. Garnish with chopped fresh parsley. Let cool for 5 minutes before serving.

Nutrition Information (Per Serving)

• Calories: 285
• Carbohydrates: 7g
• Protein: 30g
• Fat: 15g
• Fiber: 2g
• Sodium: 520mg
• Calcium: 30% DV | Vitamin C: 20% DV | Vitamin A: 15% DV | Iron: 10% DV

Note: Ground turkey is an excellent lean protein source, and zucchini adds vitamins and fiber while keeping the carb count low.

Notes

• Seriously, use medium zucchini—oversized ones hold too much water and will make the casserole watery.
• For extra insurance against sogginess, salt the diced zucchini, let sit 10 minutes in a colander, and pat dry before adding.
• Every oven runs differently—if your cheese isn’t golden at 30 minutes, a quick 2-minute broil will do it.
• 93% lean ground turkey is the sweet spot; 99% lean tends to dry out.

Storage Tips

• Refrigerate leftovers in a sealed container for up to 3 days.
• Reheat in the oven at 350°F covered with foil for 15-20 minutes, or microwave for 2-3 minutes.
• To freeze before baking: assemble without cheese, cover tightly, freeze up to 2 months. Add cheese before baking.
• To freeze after baking: cool completely, wrap tightly, freeze up to 2 months. Reheat at 350°F covered for 25 minutes.

Serving Suggestions

• Serve alongside crusty garlic bread to soak up the tomato sauce
• A simple arugula salad with lemon dressing cuts through the richness perfectly
• Pairs well with steamed rice or cauliflower rice for a heartier meal
• Great on its own for a complete low-carb dinner

Mix It Up

• Creamy Turkey and Zucchini Casserole: Stir 3 tbsp cream cheese into the turkey mixture before baking for a richer, creamier result.
• Spicy Version: Add ½ tsp red pepper flakes and one diced jalapeño with the onion for a kick.
• Holiday Squash Casserole: Replace one zucchini with yellow squash for a colorful, festive presentation.
• Dairy-Free Version: Skip the cheese and top with seasoned breadcrumbs tossed in olive oil for a crispy golden crust.

What Makes This Recipe Special

This turkey and zucchini casserole draws on Italian-American home cooking traditions where baked meat and vegetable dishes have been reliable weeknight dinners for generations. Cooking the filling on the stovetop first—before it ever touches the oven—builds a depth of flavor you just can’t get by throwing everything in raw. Combined with a double-cheese top and a quick unfoiled finish, you get a casserole that tastes like it took all afternoon when it really only took fifty minutes.