This is one of the recipes my granddaughter found while searching for some healthier alternatives to a beef burger. I switched it up a little to satisfy my hubby's taste-buds and he loved these. They've actually become one of my favorite burgers too. Of course, I love feta cheese, so maybe that has something to do with it. Haha!
Sautee onion and garlic in olive oil and butter until translucent; set aside to cool.
Chop the spinach into one-inch pieces. (I used between 1-1 1/2 cups of it chopped, but you might like more.)
Place ground turkey, feta cheese and chopped spinach in a bowl; add cooled onion & garlic; mix until all ingredients are evenly distributed.
Divide the meat into quarters and form into ½-inch-thick patties.
Cook the patties over medium-high heat in a frying pan, with a little olive oil. Flip the patties every 2 to 3 minutes. You will know they are done when the juices run clear and the meat is light brown all through the center. Use a knife to cut into the centers to make sure the meat is cooked.