In a small bowl, add your salt, onion flakes, garlic powder, cane sugar, paprika, pepper, celery seed, turmeric, and pepper. Whisk together until fully combined.
Lay out 3 1/2 sheets of aluminum foil, one on top of the other. They will be large enough that you will be able to wrap your chuck roast closed with no openings.
Place your chuck roast on top of the center of the 3 layers of aluminum foil. Fold up the outsides of the aluminum a bit, because you are about to start seasoning.