Combine spices in a spice or coffee grinder and grind into a powder. Season the Boneless Ribeye Steaks on both sides with more salt and pepper. Rub one side only of each steak with the rub and drizzle with oil. Place on the grill, rub side down and grill until slightly charred and a crust has formed, 2 to 3 minutes. Turn the steak over and continue grilling to medium-rare doneness. Remove from grill and let rest 5 minutes before serving.