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 wooden spoon for 5–7 minutes. Season with salt, pepper, dried thyme, smoked paprika, and ground 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 vegetables. Pour in chicken broth and mix thoroughly. Simmer for 3–4 minutes until liquid slightly thickens.
06 - Transfer the entire mixture to the prepared casserole dish, spreading evenly. Top with shredded mozzarella and grated Parmesan cheese in an even layer.
07 - Cover dish with aluminum foil and bake for 25 minutes to allow vegetables to cook through.
08 - Remove foil and bake for an additional 10–15 minutes, or until sweet potatoes are tender when pierced with a fork and cheese is golden and bubbly.
09 - Let casserole cool for 10 minutes before serving to allow flavors to meld and make serving easier.