Turkey Chili and Sweet Potato Shepherd's Pie

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2 1/2 pounds sweet potatoes, 4 to 5 potatoes, peeled and cubed

Salt

2 teaspoons orange zest

4 tablespoons butter, cut into pieces

1 cup creme fraiche or sour cream

Freshly ground black pepper

Freshly grated nutmeg, to taste

2 tablespoons extra-virgin olive oil

2 pounds ground turkey

1 large onion, chopped

2 small chile peppers, red fresno, jalapeno or serrano

1 red bell pepper, chopped

2 to 3 large cloves garlic, chopped

3 tablespoons chili powder (recommended: Gerhardt's)

1 tablespoon smoked sweet paprika

1 tablespoon ground cumin, a palmful

1 tablespoon ground coriander, a palmful

1/4 cup tomato paste

2 to 3 cups turkey or chicken stock

2 cups shredded sharp yellow Cheddar