Grilled Spinach Feta Burgers Recipe

In a large skillet, heat oil over medium-high heat. Add shallots; cook and stir 1-2 minutes or until tender. Add spinach and garlic; cook 30-45 seconds longer or until spinach is wilted. Transfer to a large bowl; cool slightly. Stir feta cheese and seasonings into spinach. Add beef; mix lightly but thoroughly. Shape into eight 1/2-in.-thick patties. Grill burgers, covered, over medium heat 6-8 minutes on each side or until a thermometer reads 160 °. Grill buns over medium heat, cut side down, for 30-60 seconds or until toasted. Serve burgers on buns with toppings if desired. Freeze option: Place patties on a plastic wrap-lined baking sheet; wrap and freeze until firm. Remove from pan and transfer to a resealable plastic freezer bag; return to freezer. To use, cook frozen patties as directed, increasing time as necessary for a thermometer to read 160 °.