Loaf Pan Chicken Gyros

Name: Loaf Pan Chicken Gyros
Ingredients: 1/3 cup plain whole milk Greek yogurt; 1 teaspoon lemon zest; 3 tablespoons lemon juice; 2 tablespoon extra-virgin olive oil; 3 cloves garlic, minced; 1 ½ teaspoons dried oregano; ¾ teaspoon salt; ½ teaspoon paprika; ½ teaspoon dried dill; ½ teaspoon ground black pepper; 2 pounds skinless, boneless chicken thighs; 3 to 4 (6-inch)bamboo skewers*; 6 Greek pita flatbreads; 1 (9- to 12-ounce) carton tzatziki; 1 large tomato, thinly sliced; ½ cup thinly sliced red onion