Chopped Salad with Buttermilk Dressing

Name: Chopped Salad with Buttermilk Dressing
Prep time: 20 min
Total time: 20 min
Cuisine: American
Ingredients: 2 tablespoons buttermilk; 2 tablespoons sour cream; 2 tablespoons mayonnaise; 1 tablespoon lemon juice; 1 tablespoon minced celery; 1 tablespoon minced fresh parsley; 1 teaspoon minced fresh dill; 0.5 teaspoon Dijon mustard; 0.25 teaspoon onion powder; 0.25 teaspoon salt, or more to taste; 0.25 teaspoon freshly ground black pepper, or more to taste; 2 romaine lettuce hearts, chopped into 1-inch pieces; 1 large cucumber, chopped; 1 red bell pepper, diced; 1 cup chopped cauliflower florets; 1 carrot, chopped; 1 celery stalk with leaves, diced; 3 green onions, sliced; 0.25 cup sunflower seeds; 1.5 tablespoons chopped fresh parsley; 1 pinch salt and ground black pepper to taste