In a bowl, whisk together olive oil, melted butter, minced garlic, lemon juice, paprika, Cajun seasoning, brown sugar, salt, and pepper to make the marinade.

Add the shrimp to the marinade and toss gently. Cover and let marinate in the refrigerator for 20-30 minutes.

Thread 4-5 marinated shrimp onto each skewer.

Preheat the grill to medium-high heat, around 400°F (200°C).

Grill the skewers for 2-3 minutes on each side until shrimp are pink and charred.

Brush the shrimp with remaining marinade during the last minutes of grilling.

Remove from the grill and garnish with fresh parsley before serving.