Grilled Greek Chicken Salad

• 2 teaspoons dried oregano
• 2 teaspoons dried basil
• 1 teaspoon dried thyme
• 1 teaspoon paprika
• 1 teaspoon garlic powder
• Kosher salt and freshly ground black pepper to taste
• 2 pounds boneless skinless chicken thighs
• 1 head romaine roughly chopped
• 1 cup diced cucumber
• 1 cup halved cherry tomatoes
• 1 avocado halved, seeded, peeled and sliced
• ½ small red onion thinly sliced
• ½ cup pitted kalamata olives
• 4 ounces feta cubed

For the tzatziki dressing

• 1 cup Greek yogurt
• 5 tablespoons buttermilk
• 2 tablespoons chopped fresh dill
• 2 tablespoons freshly squeezed lemon juice
• 2 teaspoons lemon zest
• 1 clove garlic minced
• Kosher salt and freshly ground black pepper to taste