1. Line a baking sheet with parchment paper; set aside.
2. Add all ingredients to a large mixing bowl; using clean hands, thoroughly mix until evenly blended.
3. Using slightly damp hands, divide mixture into 4 equal portions; shape each into a ball and place on prepared baking sheet.
4. Press down each meat ball to form a round patty about ½” thick; press your thumb into the middle of each patty to make a dent (this will prevent the patty from shrinking when cooked).
5. Place turkey patties to the freezer for at least 20 min. (this will help them hold their shape so they don’t fall apart when transferring to the air fryer).
6. Preheat air fryer to 380°.
7. Using a spatula, gently transfer turkey patties to the preheated air fryer basket; air-fry for 12-14 min. or until internal temperature reaches 165°, flipping burgers halfway through cooking time.
8. When burgers are fully cooked, top with cheese, if desired. Turn off air fryer; return burgers to air fryer basket to allow cheese to melt (this should take less than 2 min.).
9. Serve on buns with your choice of toppings. 

Tasty Tips:

• To grate the onion, place a box grater on a stack of 2-3 paper towels. Using the largest side, grate the onion until you have ¼ cup. Allow paper towels to soak up moisture from onions (no need to ring the moisture out – a little bit keeps the burgers moist).
   
• Turkey burgers can also be grilled, cooked on the stovetop or cooked in the oven. Cook to an internal temperature of 165°.
   
• Swap the buns for fresh lettuce to make a gluten-free lettuce wrap.

Recipe courtesy of Clean Plate Mama.