01 - Whisk together olive oil, balsamic vinegar, minced garlic, dried oregano, smoked paprika, salt, and black pepper in a large bowl until well combined.
02 - Add sausage pieces, bell peppers, and onion wedges to the marinade. Toss thoroughly to coat all pieces evenly. Let stand for 10-15 minutes to absorb flavors.
03 - Heat grill or grill pan to medium-high temperature, approximately 375-400°F.
04 - Thread marinated sausage, peppers, and onions onto metal or soaked wooden skewers in alternating pattern, leaving slight space between pieces for even cooking.
05 - Place skewers on preheated grill and cook for 12-15 minutes, turning every 3-4 minutes, until sausages reach internal temperature of 160°F and vegetables are tender with light charring.
06 - Transfer skewers to serving platter, sprinkle with fresh parsley, and arrange lemon wedges alongside for squeezing.