Unlike most red chile sauces - which require the re-hydration of dry pods, this sauce takes only a few minutes to prepare. Use pure New Mexican or Guajillo chili powder. The chile pods or the powders, derived from them, can be purchased online.
In a small sauce pan - over low heat, combine the chile powder, cumin, garlic and salt to taste. Stir with a whip to combine. Sprinkle in the cornstarch. Stir. Increase the heat to medium. Pour in the water. Stir until the sauce achieves the consistency of thin, tomato sauce. Drench the chicken with the sauce. Serve with pre-heated flour tortillas. Hack-off a chunk of chicken. Rip-off a piece of tortilla, then grab a chunk of saucy and cheesy chicken with the tortilla.