In a large bowl, mix together the salad greens, red apple, green apple, walnuts, feta cheese, and dried cranberries.

In another bowl, whisk together the apple juice, apple cider vinegar, honey, salt, black pepper, and olive oil until well combined.

Pour the dressing over the salad mixture and gently toss to ensure even coating.

Melt the butter in a skillet over medium heat. Add sugar, salt, and cinnamon, then mix in walnut halves. Cook until coated and caramelized.

Plate the salad and top with the optional candied walnuts if desired.