Prepare either a grill or a grill pan and set to high heat. Add coconut oil to the grill pan if using.
Mix the ground chicken with the seasonings, zucchini, red onion, coconut flour, lemon juice, and coconut oil until well combined.
Form the chicken into 4-5 burgers, evenly portioned.
Grill the burgers on the grill surface (using extra coconut oil if frying) for about 5 minutes on each side, or until internal temperature reaches 165 F.
Top with optional tzatziki and serve in lettuce cups like a bun, or enjoy the burgers on their own in a burger bowl
For the tzatziki
Combine all of the ingredients in a bowl and mix well. Add more salt to taste.
Notes
All nutritional information are estimations and will vary. Estimations do not include optional ingredients.