Greek Turkey Burgers with Tzatziki Sauce

Ingredients

• Turkey Burgers
• 1 tablespoon extra-virgin olive oil
• 1 sweet onion, minced
• 2 garlic cloves, minced
• 1 egg
• ½ cup chopped fresh parsley
• ½ teaspoon dried oregano
• ¼ teaspoon red-pepper flakes
• 1 pound ground turkey
• ¾ cup bread crumbs
• Salt and freshly ground black pepper
• Tzatziki Sauce
• 1 cup Greek yogurt
• ½ European cucumber, diced
• 2 tablespoons lemon juice
• 1 pinch garlic powder
• ¼ cup chopped fresh parsley
• Burger Toppings
• 4 whole-wheat hamburger buns
• ½ red onion, sliced
• 8 Boston lettuce leaves
• 2 tomatoes, sliced