Spanakopita Burgers

This is a very healthy, fabulous burger. Even the guys in my house love it.

1 pound lean ground turkey
1/3 of a box of frozen spinach, thawed and drained (squeeze out all of the liquid)
2 ounces of feta cheese, crumbled
2 teaspoons greek seasoning
(If you don't have that, combine 1 teaspoon lemon pepper with 1/4 teaspoon granulated garlic and 1 teaspoon dried oregano)
1/4 cup diced red onion (can omit if you don't like onion - or you can top the burgers with sliced red onion if you prefer.)

Combine the ingredients and form into 4 patties. Grill and serve on a whole wheat bun. I personally like to put a mixture of equal parts mayo and dijon mustard, as ketchup really doesn't work on this.