Put all the ingredients in a small jar and shake to combine. Store in an airtight container for up to 1 month.
To use, break up 1 pound of ground beef in a wide skillet over medium heat. As soon as it starts to sizzle, sprinkle on 2-3 tablespoon of this taco seasoning and add 1 cup water. Continue stirring. As moisture cooks out of the meat and simmers, it will be thickened by the cornstarch.