Cajun Chicken Salad with Avocado Ranch Dressing

• 1 pound boneless skinless chicken breast
• 1 tablespoon Cajun Seasoning
• 4 cups chopped romaine lettuce
• 1 cup cherry tomatoes, cut in half
• 1 large cucumber, sliced
• ¼ cup diced red onion, about ¼ an onion
• ¼ cup crumbled Feta cheese

Avocado Ranch Dressing

• 1 large ripe avocado
• ¼ cup mayonnaise
• ¼ cup sour cream
• ¼ cup buttermilk
• 2 teaspoons distilled white vinegar
• ½ teaspoon dried parsley
• ¼ teaspoon dried dill
• ¼ teaspoon onion powder
• ¼ teaspoon garlic powder
• ⅛ teaspoon salt