Chicken Gyros

Name: Chicken Gyros
Prep time: 40 min
Total time: 40 min
Cuisine: Greek
Ingredients: 1 pound boneless, skinless chicken breasts; 1/4 cup olive oil; 2 tablespoons red wine vinegar; 2 tablespoons fresh lemon juice; 4 cloves garlic, smashed; 1 1/2 teaspoons kosher salt; 1 teaspoon dried oregano; 1 teaspoon lemon pepper; Nonstick cooking spray; 1/2 cup plain whole-milk yogurt; 1/4 cup diced English cucumber; 2 tablespoons chopped fresh dill; 1 tablespoon lemon juice; 1 small clove garlic, minced; 1/8 teaspoon kosher salt; Freshly ground black pepper; Four (6-inch) pitas or naan; 4 cups thinly chopped romaine (from 1 head); 2 ripe tomatoes, thinly sliced; 1/4 red onion, thinly sliced; 1/4 cup sliced pepperoncini; 1/4 cup crumbled feta