Rub the grill grate with olive oil and preheat the grill to between 375 and 400.
Mix the dry seasonings in a small bowl.
Using your hands, mix the chicken, seasonings, egg, panko, and spinach in a large bowl.
Divide the chicken into four patties, making a small dent in the center of each.
Brush the burgers with olive oil, place them on the grill, and cook for 4 to 5 minutes with the grill closed. Then, flip the burgers and grill for another 4 to 5 minutes until their internal temperature reaches 165 degrees.
Video
Notes
Storage
Refrigerate for up to 3 days in an airtight container.
Wrap individual burgers in plastic wrap and freeze for up to 3 months in an airtight, freezer-safe container or heavy-duty freezer bag.
Defrost overnight if frozen. Then, microwave the bugers at 1-minute intervals until heated through.
Tips
Mixing your burgers by hand ensures you don't overwork them. I like to use these Nitrile gloves to keep my hands clean and prevent cross-contamination.
Mix your ingredients until everything is well combined, but be careful not to overmix. Overworking the meat causes the proteins to contract as they cook, squeezing out the juice and resulting in dry burgers.
Be sure you create a depression in the center of the burgers. This keeps them from shrinking too much.
Brush your grill grate with olive oil to prevent sticking while the burgers cook.
Your burgers will release some juice as they cook. That's okay and completely unavoidable.
Grill the burgers with the lid closed. This retains the heat and keeps the burgers juicy.