Prepare the salad components by washing and drying the vegetables, then slicing the cucumbers into thin discs, cutting the grape tomatoes in half, and slicing the onion into thin strips. Wait to peel and slice the avocado until just before serving.
2 cups grape tomatoes, 1 English cucumber, 1/2 of a red onion
Prepare the creamy Cajun salad dressing by processing all of the dressing ingredients together in a blender or food processor until completely combined. I would recommend starting with 1 teaspoon of Cajun seasoning and increasing the amount until you reach your desired level of heat. Refrigerate for 20 minutes before serving.
1 cup buttermilk, 3/4 cup mayonnaise, 1/2 cup sour cream, 1/4 cup freshly grated Parmesan, Juice from 1/2 a lemon, 1 Tablespoon red wine vinegar, 1 teaspoon Kosher salt, 1-2 teaspoons Cajun seasoning, Freshly ground black pepper, 2 teaspoons garlic
Heat grill to medium-high heat. Place the chicken breasts on a baking sheet or large dish and pat dry. Drizzle lightly with olive oil and rub the chicken to coat evenly. Sprinkle 1/2 teaspoon of the Cajun seasoning over the top of each chicken breast, turn the chicken over and sprinkle each chicken breast with another 1/2 teaspoon of Cajun seasoning so the chicken is evenly coated on both sides.
4 boneless skinless chicken breasts, 2 Tablespoons olive oil, 4 teaspoons Cajun seasoning
Place the chicken breasts directly over the heated side of the grill and grill for about 5-6 minutes per side, depending on the thickness of your chicken, until the internal temperature of the breasts reach 160°F using an instant read meat thermometer. You can also check whether the chicken is done by making a small cut into the thickest part to see if it is opaque in the center, or pressing on the thickest end of the chicken with your finger to see if there is any resistance. If there is no resistance, the chicken is done. Remove from the grill and rest for 5 minutes.
Prepare each salad plate by dividing the lettuce between four large plates. Arrange the tomatoes, onions, cucumbers, and avocado on top of the lettuce, then slice each chicken breast into strips and arrange on top of each salad. Serve with Creamy Cajun Dressing.
4-6 cups mixed lettuce greens, 1 avocado