In a skillet, heat the oil. Add the turkey; cook over moderately high heat, breaking it up, until browned, 5 minutes. Stir in the sage, chipotles, 1/2 teaspoon each of salt and pepper, and the flour; cook for 1 minute. Add the milk and simmer, stirring, until thick, 5 minutes. Add the 2 tablespoons of chives.