Chopped Salad with Buttermilk Dressing

Dressing:

• 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

• ½ teaspoon Dijon mustard

• ¼ teaspoon onion powder

• ¼ teaspoon salt, or more to taste

• ¼ teaspoon freshly ground black pepper, or more to taste

Salad:

• 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

• ¼ cup sunflower seeds

• 1 ½ tablespoons chopped fresh parsley

• 1 pinch salt and ground black pepper to taste