Core and chop the red and green apples into thin slices or 1-inch chunks. In a large bowl, toss together the salad greens, chopped apples, walnuts, feta, bacon (if using), and dried cranberries.

Whisk together the dressing ingredients or combine them in a jar and shake vigorously. Toss the salad with the dressing immediately before serving to keep the ingredients fresh.

Line a baking sheet with greased parchment paper or a nonstick baking mat. In a medium nonstick pan over medium heat, melt the butter and sugar.

Once the butter is melted, stir in the walnut halves, salt, and cinnamon. Continue to stir until the walnuts are well coated. Remove from heat and immediately spread walnuts out in a single layer on the prepared baking sheet. Allow to cool for 5-10 minutes.