01 - Whisk together olive oil, lemon juice, Cajun seasoning, smoked paprika, garlic powder, onion powder, thyme, oregano, salt, black pepper, and cayenne pepper in a large bowl until well combined.
02 - Add shrimp to the bowl and toss to coat evenly. Cover and refrigerate for 20 minutes to absorb flavors.
03 - Preheat grill or grill pan to medium-high heat. If using wooden skewers, soak in water for 20 minutes to prevent burning.
04 - Thread marinated shrimp onto skewers if desired for easier handling and turning on the grill.
05 - Grill shrimp for 2-3 minutes per side until opaque and slightly charred, being careful not to overcook.
06 - Transfer grilled shrimp to serving platter, sprinkle with fresh parsley, and accompany with lemon wedges.