Add the chili powder, cumin, paprika, garlic powder, onion powder, oregano, salt, black pepper, cayenne, red pepper flakes if using, and cornstarch if using to a small bowl or jar. Whisk thoroughly or seal the jar and shake until the color and texture look evenly mixed.

For taco meat, brown 1 pound of ground meat in a skillet over medium-high heat, breaking it into small pieces as it cooks. Drain excess fat if necessary, leaving just enough moisture to help the seasoning cling to the meat.

Stir 2 tablespoons of the taco seasoning into the browned meat, then pour in about 1/2 cup water. Simmer uncovered for 3–5 minutes, stirring occasionally, until the liquid reduces and the meat is coated.