This burger is dressed up with olive tapenade, grilled zucchini and onions, and fresh spinach. It's chockfull of vegetables and flavor!
Combine yogurt and 1/4 cup tapenade in small bowl. Cover and refrigerate until ready to use.
Combine Ground Beef and remaining 1/4 cup tapenade in large bowl, mixing lightly but thoroughly. Lightly shape into four 1/2-inch thick patties.
Heat grill pan over medium heat until hot. Place patties in pan; cook 10 to 12 minutes until instant-read thermometer inserted horizontally into center registers 160°F, turning occasionally. Season with pepper, as desired. Remove; keep warm.
Add onion and zucchini to grill pan over medium heat; season with salt and pepper, as desired. Cook 5 to 6 minutes or until lightly browned and crisp-tender, turning occasionally.
Place 1 tablespoon cheese on bottom of each bun; top evenly with spinach leaves, onion, burger and zucchini. Spread 2 tablespoons yogurt mixture on cut side of each bun top. Close sandwiches.
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* Based on a 2,000 calorie diet
** Percent Daily Values are based on a 2,000-calorie diet
Nutrition information per serving: 406 Calories; 19g Total Fat; 6g Saturated Fat; 4g Monounsaturated Fat; 74mg Cholesterol; 655mg Sodium; 30g Total carbohydrate; 30g Protein; 5.3mg Iron; 7.3mg Niacin; 0.6mg Vitamin B6; 2.3mcg Vitamin B12; 6.4mg Zinc; 34mcg Selenium; 4.8g Fiber.