Preheat your oven: Set your oven to 375°F (190°C). This ensures that your casserole bakes evenly.
Prepare your baking dish: Grease a 9x13-inch baking dish lightly to prevent sticking.
Cook the turkey: In a large skillet over medium heat, add 1 lb ground turkey. Add 1 small diced onion and 2 minced garlic cloves. Sauté until the turkey is browned and the onion is translucent, approximately 5-7 minutes. Drain any excess fat.
Add the sauce and veggies: Stir in 1 can (8 oz) tomato sauce, 1 cup frozen corn, 2 tbsp Worcestershire sauce, 1 tsp dried thyme, and salt & pepper to taste. Allow it to simmer for about 5-7 minutes, so the flavors meld.
Layer the baking dish: Transfer the turkey mixture to the greased baking dish. Spread it evenly across the bottom.
Add the cheese: Sprinkle 2 cups shredded mozzarella cheese over the turkey mixture, covering it attractively.
Top with tater tots: Arrange 1 bag (32 oz) frozen tater tots across the top of the cheese layer. Position them closely for a crispy finish.
Bake the casserole: Place the dish in the preheated oven and bake for 25-30 minutes, or until the tater tots are golden brown and the cheese is bubbly.
Garnish and serve: Once baked, remove it from the oven and sprinkle with additional thyme for garnish. Let it cool slightly before serving. Enjoy!