Measure 3 tablespoons chili powder into a small bowl.
Add 1 tablespoon ground cumin.
Stir in 1 teaspoon garlic powder and 1 teaspoon onion powder.
Add 1 teaspoon smoked paprika, ½ teaspoon dried oregano, ½ teaspoon cayenne pepper, 1 teaspoon salt, and ½ teaspoon black pepper.
Mix thoroughly until the spices form a uniform color and texture.
Transfer the seasoning blend to an airtight container and store in a cool, dark place for up to several months.