Step 1: In a large mixing bowl, gently combine the ground chicken, crumbled feta cheese, finely diced red onion, minced garlic, chopped fresh dill, chopped fresh parsley, breadcrumbs, egg, lemon zest, dried oregano, salt, and black pepper. Mix until just combined, being careful not to overmix.
Step 2: Divide the mixture into four equal portions and gently form them into patties, about 3/4-inch thick. Make a slight indentation in the center of each patty with your thumb to help them cook evenly.
Step 3: Heat 1 tablespoon of olive oil in a large non-stick skillet over medium heat. Once the oil is shimmering, carefully place the chicken patties in the skillet. Cook in batches if necessary to avoid overcrowding.
Step 4: Cook the burgers for 5-7 minutes per side, or until they are golden brown on the outside and cooked through, reaching an internal temperature of 165°F (74°C).
Step 5: While the burgers are cooking, prepare your desired toppings such as homemade tzatziki, fresh lettuce, sliced tomatoes, and cucumber.
Step 6: Remove the cooked burgers from the skillet and let them rest for a couple of minutes before serving. This allows the juices to redistribute, ensuring a tender and moist burger.
Step 7: Assemble your burgers: Place a patty on a pita or bun, then generously top with tzatziki, lettuce, tomato, and cucumber. Serve immediately and enjoy!