||Preheat oven to 425ºF. Spray baking sheet with cooking spray. Place frozen strips in a single layer on baking sheet and heat for 15-17 minutes. For a crispier product, turn halfway through heating time. Let stand 2-3 minutes before serving.
||In a bowl, combine the yogurt, tomatoes, feta cheese, cucumber, dill, lemon juice and zest, garlic, salt and black pepper. Mix well.
||Warm pita bread by wrapping in paper towels and heating in the microwave for 10 to 20 seconds on HIGH.
||Top warm pita bread with shredded romaine lettuce, 3 to 4 chicken strips and yogurt sauce. Sprinkle with chopped red onion and serve.