Stir all the ingredients together. Store in an airtight container. If wanting to make fajitas, see the next steps.
3 tablespoons dark brown sugar, 1 tablespoon ground cumin, 2 teaspoons kosher salt, 2 teaspoons smoked paprika, 1 teaspoon black pepper, 1 teaspoon dried oregano, 1 teaspoon garlic powder, 1 teaspoon crushed red pepper flakes, ¼ teaspoon ground nutmeg, ¼ teaspoon dried thyme, ¼ teaspoon dried rosemary