Gather measuring spoons and a small bowl or a clean glass jar with a tight-fitting lid. Measure out: 1 tablespoon chili powder, 2 teaspoons paprika (smoked paprika optional), 1 teaspoon cumin, 1 teaspoon oregano, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/4 teaspoon kosher salt, 1/4 teaspoon black pepper, and 1/4 teaspoon red pepper flakes.
Add each measured spice to the bowl or directly into the glass jar.
If using a bowl: stir the spices thoroughly with a spoon or whisk until uniformly blended. If using a jar: secure the lid and shake vigorously for 20–30 seconds until evenly mixed.
Transfer the blended seasoning into a clean glass container with a lid if you mixed in a bowl.
Label the container (Taco Seasoning and the date), then store it in a cool, dry place.
Use the seasoning as desired; shake or stir before each use to redistribute any settled bits.