01 - Whisk together olive oil, lemon juice, smoked paprika, garlic powder, onion powder, salt, and pepper in a large bowl until fully incorporated.
02 - Add steak cubes and shrimp to the marinade. Toss until evenly coated. Cover and refrigerate for 15 to 30 minutes.
03 - Heat grill to medium-high, approximately 425°F. If using wooden skewers, soak in water for at least 20 minutes prior to use.
04 - Thread steak and shrimp alternately onto skewers, maintaining space between pieces for uniform heat circulation.
05 - Place skewers on preheated grill. Cook for 6 to 8 minutes, turning occasionally, until steak reaches medium-rare and shrimp turn opaque and pink.
06 - Melt butter in small saucepan over medium heat. Add minced garlic and sauté 1 to 2 minutes until fragrant. Whisk in parsley, lemon juice, salt, and pepper. Remove from heat.
07 - Transfer skewers from grill to serving platter. Drizzle immediately with warm garlic butter sauce. Garnish with additional parsley and accompany with lemon wedges.