Spinach Feta Burgers

Ingredients

• 10 oz frozen spinach, thawed and well-drained
• 1 lb lean ground chicken
• 1 egg, medium
• 1/2 cup feta cheese, crumbled
• 2 cloves garlic, minced
• 1 cup onions, diced
• 1 tsp oregano, dried
• 6 whole grain hamburger
• 2 tomatoes, medium, sliced
• 6 slices onions, sliced
• 1 1/2 cups field or mixed salad greens