Sheet Pan Chicken Gyros

• 2 pounds boneless, skinless chicken thighs cut into thin strips
• 1 ½ tablespoons olive oil
• 1 tablespoon freshly squeezed lemon juice
• 6 Pita flatbreads
• 2 cups shredded romaine
• 2 cups cherry tomatoes halved
• 1 red onion thinly sliced
• 1 English cucumber thinly sliced
• ½ cup crumbled Feta cheese
• Tzatziki sauce homemade or store-bought

For the garlic mixture

• 3 cloves garlic minced
• 2 teaspoons dried oregano
• 1 ½ teaspoons ground coriander
• 1 ½ teaspoons dried thyme
• ½ teaspoon ground cumin
• ¼ teaspoon cayenne pepper
• ¼ teaspoon ground cinnamon
• Kosher salt and freshly ground black pepper to taste