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["Preheat broiler.", "Soak ancho chiles in boiling water (1 cup), 5 minutes.", "While chiles soak, broil tomatoes, onion slice, and garlic on a foil-lined rimmed baking sheet 3""-4"" from heat, turning once, until lightly charred, 5-7 minutes.", "Drain chiles, discarding soaking liquid, and add to blender with tomatoes, onion, garlic, chipotles with sauce, cumin, 1/2 teaspoon salt, and cold water (2 tablespoons). Puree until smooth.", "Preheat oven to 350u00b0F. Wrap 2 stacks of tortillas in foil; warm in oven while finishing filling.", "Cook potatoes in a 3- to 4-quart pot of well-salted boiling water until just tender but not falling apart, 5-7 minutes. Drain.", "Coarsely grind chicken in a meat grinder or food processor (or use pre-ground meat).", "Heat oil in a 12"" heavy skillet over medium-high heat until it shimmers. Add chile puree (it will splatter) and cook, stirring, 4 minutes (sauce will thicken).", "Add ground chicken and cook, stirring and breaking up clumps, 1 minute. Cover skillet and reduce heat; simmer, stirring occasionally, until chicken is cooked through, about 4 minutes.", "Gently stir in potatoes and reheat.", "Serve chicken and potatoes with warm tortillas and accompaniments."]