To prepare a turkey chili and sweet potato shepherds pie recipe, you will first need to prepare your ingredients. You will need: 1 pound ground turkey, 1 cup chopped sweet potatoes, 2 tablespoons olive oil, and 1 teaspoon kosher salt. Place the turkey in the roasting pan and cook over medium-high heat, stirring occasionally, until it is no longer pink, about 1 hour. Remove it from the oven and allow it to rest for 10 minutes. Add the remaining ingredients and stir to combine. Pour the mixture into the pie shell and bake for 35 to 40 minutes, or until the top is brown and the filling is bubbly. Serve with sour cream, if desired.