Combine the brown sugar, salt, black pepper, paprika, chili powder, garlic powder, onion powder, garlic salt, turmeric, and cornstarch in a mixing bowl.
Rub approximately 1 tablespoon of the seasoning mixture over the front and back of each steak.
Let the seasoned steaks rest at room temperature for at least 30 minutes.
Preheat the grill to 400°F. Spray or brush the grill grates with oil.
Place the steaks on the hot grill and cook for 3–5 minutes, depending on your desired doneness.
Flip the steaks and cook for another 3–5 minutes.
Remove the steaks from the grill and let them rest for at least 5 minutes before slicing or serving.
Video
Notes
The best way to test for doneness is by inserting an instant read thermometer into the thickest part of the steak. Rare – 120F, cool to warm red centerMedium Rare – 130F, Warm red centerMedium – 140F, Hot pink centerMedium Well – 150F, Mostly brown centerWell Done – 160F, full brown in colorThe recipe is written for a sirloin steak but this rub can easily be used on a Ribeye, T-Bones or Steak Strip as well.