1. Preheat oven to 400°.
2. Arrange chicken in an 8-inch square baking dish; squeeze lime juice evenly over chicken. Sprinkle evenly with taco seasoning.
3. Slice chiles lengthwise, cutting to, but not through, other side; open flat. Place 1 chile over each chicken thigh. Cover dish with foil; bake at 400° for 30 minutes. Sprinkle cheese evenly over chiles and chicken; bake, uncovered, an additional 5 minutes or until cheese melts.