Begin by washing the mixed greens thoroughly to remove any dirt and debris, then pat them dry with a clean towel. Next, slice the Honeycrisp apples into thin wedges, leaving the skin on for extra color and crunch. Finally, finely chop the red onion, ensuring it's ready to enhance the salad with its mild sharpness.

In a small bowl or jar, combine 1/4 cup olive oil, 2 tablespoons of apple cider vinegar, 1 tablespoon honey, and 1 teaspoon Dijon mustard. Whisk the mixture vigorously for about 30 seconds, or until it emulsifies and thickens slightly. Taste and season with salt and pepper to your liking; this vinaigrette will splendidly complement your Honeycrisp Apple and Feta Salad.

In a large mixing bowl, pile in the fresh mixed greens followed by the sliced Honeycrisp apples, crumbled feta cheese, and dried cranberries. Add the chopped red onion and candied walnuts for a delightful crunch. Gently toss all these vibrant ingredients together, ensuring even distribution before adding the vinaigrette.

Just before serving, drizzle the freshly whisked dressing over your salad mixture. Using salad tongs, toss the salad gently to coat the ingredients evenly. Serve immediately to enjoy the wonderful textures and flavors of your Honeycrisp Apple and Feta Salad while everything is still fresh and crisp.