01 - Preheat oven to 400°F. Lightly grease a 9x13-inch casserole dish with cooking spray or a small amount of oil.
02 - Heat 1 tbsp olive oil in a large skillet over medium heat. Add ground turkey and cook until browned, breaking it up with a spoon, about 5–7 minutes. Season with salt, pepper, thyme, smoked paprika, and cumin. Transfer turkey to a plate and set aside.
03 - In the same skillet, add remaining 1 tbsp olive oil. Sauté diced onion and red bell pepper until softened, about 5 minutes. Add minced garlic and cook for 1 minute until fragrant.
04 - Stir in diced sweet potatoes and cook for 5 minutes, stirring occasionally. Add chopped spinach and cook until wilted, about 2 minutes.
05 - Return browned turkey to the skillet with the vegetables. Pour in chicken broth and mix well. Simmer for 3–4 minutes until the liquid slightly thickens and everything is heated through.
06 - Transfer the turkey and vegetable mixture to the prepared casserole dish. Spread evenly. Top evenly with shredded mozzarella and grated Parmesan cheese.
07 - Cover the dish with aluminum foil and bake for 25 minutes.
08 - Remove the foil and bake for an additional 10–15 minutes, or until sweet potatoes are tender when pierced with a fork and the cheese is golden and bubbly.
09 - Let the casserole cool for 10 minutes before serving to allow it to set and make serving easier.