01 - Whisk together olive oil, lemon juice, smoked paprika, garlic powder, onion powder, salt, and pepper in a large bowl until fully combined.
02 - Add steak cubes and shrimp to the marinade. Toss until evenly coated. Cover and refrigerate for 15-30 minutes.
03 - Preheat grill to medium-high heat (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, ensuring pieces are well spaced for even cooking.
05 - Place skewers on the grill. Cook, turning occasionally, for 6-8 minutes or until steak reaches medium-rare and shrimp are opaque and pink.
06 - Melt butter in a small saucepan over medium heat. Add minced garlic and cook for 1-2 minutes until fragrant but not browned. Stir in parsley, lemon juice, salt, and pepper. Remove from heat.
07 - Remove skewers from the grill. Immediately drizzle with warm garlic butter sauce. Garnish with extra parsley and serve with lemon wedges.