Spinach Feta Burgers - Chicken Farmers

Ingredients

• 10 oz (285 g) frozen spinach, thawed and well-drained
• 1 lb (0.5 kg) lean ground chicken
• 1 egg, medium
• 1/2 cup (125 mL) feta cheese, crumbled
• 2 cloves garlic, minced
• 1 cup (250 mL) onions, diced
• 1 tsp (5 mL) oregano, dried
• 6 whole grain hamburger
• 2 tomatoes, medium, sliced
• 6 slices onions, sliced
• 1 1/2 cups (375 mL) field or mixed salad greens