On the stovetop, preheat a pan over medium-high heat.
In a large bowl, combine the turkey, egg, oats, baby spinach, onions, and sea salt. Divide the mixture into 8 equal portions and form patties between the palms of your hands. Wetting your hands with water, before you work with the turkey, will prevent sticking.
Lightly spray the pan with cooking spray. Working in batches, transfer the patties to the pan. Let them lightly brown on the bottom before flipping, about 5 minutes.
Place a lid over your pan while the second side cooks, about 2 to 3 minutes. Serve with your favorite burger fixings.