In a large mixing bowl add the ground chicken, Parmesan cheese, egg, garlic, lemon zest, Italian seasoning, salt, and pepper. Mix together, then roll out 25 meatballs.
Preheat a large skillet with the butter, over high heat. Once the pan is hot and butter has melted and stopped foaming, then lower the heat to medium-high.
Add the meatballs, then cook until they are browned evenly and cooked through. Take them out of the pan and set aside.
To serve divide up the lettuce leaves into bowls then add the cucumbers, cherry tomatoes, bell pepper, red onion, and olive oil.
Mix together the sour cream, mayonnaise, tomato paste, sun-dried tomatoes, basil, lemon juice, salt, and pepper to create the tomato and basil dressing.
Add 5 meatballs per bowl, and 3 tablespoons of dressing per bowl.