Preheat the Oven: Preheat your oven to 375°F (190°C).

Cook the Ground Turkey: Warm 1 tablespoon of olive oil in a large skillet over medium heat until it’s hot. Add the ground turkey, seasoning with salt, pepper, and 1 teaspoon of garlic powder. Cook the turkey until browned and fully cooked through, about 6-8 minutes. Set aside.

Prepare the Vegetables: In a large mixing bowl, toss the diced sweet potatoes and sliced zucchini with 3 tablespoons of olive oil, the remaining garlic powder, rosemary, and a generous pinch of salt and pepper.

Assemble the Casserole: Grease a large casserole dish with 1 tablespoon of olive oil. Spread the cooked ground turkey evenly across the bottom of the dish. Layer the sweet potatoes and zucchini over the turkey. Sprinkle the shredded parmesan cheese evenly on top.

Bake the Casserole: Tent the dish with aluminum foil and place it in the preheated oven to bake for 30 minutes. Remove the foil and continue baking for an additional 10-15 minutes, or until the sweet potatoes are tender and the cheese is melted and golden.

Serve: Take the casserole out of the oven and let it sit for a few minutes to cool slightly before serving. Enjoy this delicious and healthy meal as is, or pair it with a simple side salad for an extra dose of veggies.