Mix the paprika, brown sugar, black pepper, kosher salt, onion powder, garlic powder, dry mustard, and cayenne in a small bowl.
1 tablespoon paprika, 1 tablespoon brown sugar, 1/2 tablespoon kosher salt, 3/4 teaspoon black pepper, 1 teaspoon onion powder, 1 teaspoon garlic powder, 1 teaspoon ground mustard, 1/8 teaspoon cayenne pepper