Cabbage and Apple Slaw

I love the colors of this Cabbage and Apple Slaw recipe from My Recipes.com

2 cups shredded green cabbage
2 cups shredded red cabbage
1/2 cup mayonnaise
1/4 cup sour cream
2 tablespoons cider vinegar
1/2 teaspoon celery seed
1/2 teaspoon kosher salt
1/8 teaspoon black pepper
1 large unpeeled Fuji apple—cored, quartered, and thinly sliced
2 tablespoons finely chopped fresh flat-leaf parsley (optional)

In a large bowl, combine the green and red cabbages; set aside. In a medium bowl, whisk together the mayonnaise, sour cream, vinegar, celery seed, salt, and pepper. Add the apple slices. Pour over the cabbage and toss gently until coated. Cover and chill 1 hour or longer. To serve, spoon into salad bowls and sprinkle with the parsley (if desired).