Toast chiles, cumin, coriander, pepper flakes, and peppercorns in 10-inch skillet over medium-low heat, stirring frequently, until just beginning to smoke, 3 to 4 minutes. Transfer to plate to cool, about 5 minutes. Grind spices in spice grinder or in mortar with pestle until coarsely ground. Transfer spices to bowl and stir in sugar, paprika, cloves, salt, onion powder, and garlic powder.

Makes about 2/3 cup; enough for 3 pounds steak