Preheat grill to medium high heat. Spray the grill with cooking spray.
In a small bowl combine maple, mustard, chili powder, onion powder and garlic powder.
Brush half of the marinade on the salmon, set the rest of the marinade aside.
Place the salmon skin side down and cook for 4-5 minutes then flip. Cook for an additional 4 minutes or until fully cooked. (depends on thickness of salmon)
Spoon the rest of the sauce on the salmon and serve immediately.