In a medium to large bowl, add the ground chicken, chives, oregano, minced garlic, lemon juice, breadcrumbs, mayo, and salt and pepper. Using your hands, gently mix everything together, taking care to not over handle the mixture.
Chop the chives and oregano, and prepare your toppings (tomato, avocado, onion).
Oil and pre-heat grill to medium-high heat.
Make the burger sauce by mixing the sauce ingredients together (mayo, mustard, lemon juice, smoked paprika).