Preheat your oven to 375°F (190°C) and prepare a 9x13-inch baking dish by greasing it lightly.

Sauté the chopped onion and minced garlic in olive oil over medium heat for about 2 minutes.

Add the ground turkey to the skillet, using a spatula to break it up. Cook for about 5-6 minutes, or until browned.

Stir in the diced tomatoes, Italian herbs, salt, and pepper, letting the mixture simmer for 3-4 minutes.

Layer half of the zucchini in the greased baking dish, followed by half the turkey mixture and half the mozzarella cheese. Repeat.

Bake the dish uncovered for 30-35 minutes or until bubbly and cheese is golden brown. Let cool for 5 minutes before serving.