To make the burgers combine first 7 ingredients. Divide mixture into four portions and shape into a 1/2 inch-thick patty.
Place into oven and bake your burgers for about 20 minutes, flipping burgers halfway through.
Remove burgers from oven once done and immediately place into half of a pita. Add 1 1/2 tablespoons of feta cheese, tomato slice, and avocado slices. Serves 4.
To make gluten free: use gluten free pitas or buns.