Step 1: Preheat your oven to 400°F (200°C). On a large rimmed baking sheet or in a 9x13 inch baking dish, toss the diced sweet potatoes with 1 tablespoon of olive oil, salt, and pepper.
Step 2: Roast the sweet potatoes in the oven for 15-18 minutes until they start to soften.
Step 3: While potatoes roast, heat the remaining 1 tablespoon of olive oil in a skillet over medium heat. Add the ground turkey and onion. Cook until the turkey is browned and the onion is translucent, breaking up the meat with a spoon.
Step 4: Stir in the minced garlic, bell pepper, chili powder, cumin, and smoked paprika. Cook for another 2-3 minutes until the pepper begins to soften and spices are fragrant.
Step 5: Remove the baking dish from the oven. Carefully add the ground turkey mixture to the sweet potatoes and toss gently to combine. Spread back into an even layer.
Step 6: Bake for an additional 15 minutes. If using cheese, sprinkle it over the top during the last 5 minutes of cooking. Garnish with fresh herbs before serving.