Start by preheating your oven to 400°F (200°C). Peel and chop your sweet potatoes into bite-sized cubes. Toss them with 2 tbsp of olive oil, 1/2 tsp garlic powder, 1/2 tsp rosemary, salt, and pepper. Spread them in a baking dish and bake for 30 minutes until tender.
While the sweet potatoes bake, heat 1 tbsp olive oil in a skillet over medium heat. Add the ground turkey along with 1 tsp garlic powder, 1/2 tsp rosemary, salt, and pepper. Cook until fully browned and slightly crispy on the edges, about 8–10 minutes.
Chop the zucchini into slices and then quarter them for even cooking. This ensures they roast nicely without getting mushy. Set aside until the sweet potatoes are done.
Remove the sweet potatoes from the oven and add the browned ground turkey and zucchini. Gently toss everything together, drizzle with 2 more tbsp of olive oil, and sprinkle with freshly grated parmesan cheese. Return to the oven and bake for an additional 10 minutes until cheese melts and everything is heated through.