Add packed brown sugar, onion powder, garlic powder, Creole seasoning, black pepper, paprika, sea salt, cumin, chili powder, and mustard powder to a bowl.
¾ cup brown sugar packed, 2 tablespoons onion powder, 2 tablespoons garlic powder, 2 tablespoons creole seasoning, 3 teaspoons black pepper, 4 teaspoons paprika, 2 teaspoons salt, ½ teaspoon cumin, ½ teaspoon chili powder, ½ teaspoon mustard powder