Preheat oven to 475°. Wash sweet potatoes, peel, and chop into small cubes. Season with oil, salt and pepper, and bake for at least 25 minutes.
In a large skillet over medium-high heat add ½ tbsp olive oil. Once hot, add onions and cook until fragrant. Add turkey, salt and pepper and cook for 10-15 minutes, or until done.
Add the package of taco seasoning. Stir well (you may need to add 2 tbsp of water to ensure all the seasoning is absorbed).
Top with cheese and either cover until cheese is melted or place under the broiler for about 5 minutes until bubbly. Serve over lettuce topped with greek yogurt, salsa and guacamole.
