Feta Chicken Burgers

Ingredients

• 1/2 cup cucumber, finely chopped
• 1/2 cup low-fat mayonnaise
• 1/2 cup roasted sweet red pepper, chopped
• 1 tsp. garlic powder
• 1/2 tsp. Greek seasoning
• 1/4 tsp. black pepper
• 1 1/2 pounds of lean ground chicken
• 1 cup (3.5 ounces) fat-free crumbled feta cheese
• olive oil spray
• 6 whole wheat hamburger buns, split and toasted
• 2 cups baby spinach
• 1 large tomato, cut into 6 slices