Start by making the Greek seasoning. Mix the garlic powder and all of the herbs together in a small bowl and set aside.
In a large mixing bowl, combine the ground turkey, egg, oats, garlic, onion, fresh dill, 1 tbsp of the homemade Greek seasoning, salt and pepper. Stir well.
Scoop roughly ¾ cup of the meat mixture into your hands (I like to use plastic cooking gloves) and pat it back and forth until it forms a disk that is roughly ½ inch thick. Use your fingers to round the edges. Set this on a plate lined with parchment paper or tin foil and repeat with the remaining meat until it is all formed into patties.
Heat the air fryer to 400℉. Lightly coat the bottom of the air fryer basket with oil or cooking spray. Add the hamburger patties, making sure they are evenly spaced out.
Cook the burgers for 4-5 minutes on each side. Use a meat thermometer to ensure the cooked burgers reach the recommended internal temperature of 165℉ or 74℃.
See below for alternative cooking instructions.
Once the burgers are cooked, spread a generous helping of tzatziki on the burger bun, add the burger and top with lettuce and tomato. Serve with your choice of additional condiments and side dishes and enjoy!