DO-AHEAD TIP: If using bamboo skewers, presoak them in water for 30 minutes, to prevent burning on the grill.
Preheat outdoor grill to MEDIUM-HIGH.
In a small bowl, combine seasonings (salt through onion powder).
Thread shrimp onto skewers; brush with olive oil then evenly sprinkle with spice mixture.
Grill skewers for 2 to 4 minutes per side or until shrimp are pink and opaque (do not overcook!).