Place the top oven rack in the center position and pre-heat the oven to 350°F.
In a small bowl, toss walnuts with honey and cinnamon until evenly coated. Arrange walnuts in a single layer on a rimmed baking sheet lined with parchment paper or a Silpat™ baking mat.
Place baking sheet in a pre-heated oven and bake for 8-10 minutes. Remove from oven and set aside.
Add sliced apples to a large salad bowl and sprinkle with lemon juice. Toss until well coated. Add arugula, seasoned walnuts, red onion slices, and blue cheese to the bowl and gently toss to combine.
Drizzle salad with a little Green Goddess salad dressing right before serving and toss to combine. Serve immediately with remaining dressing on the side. Enjoy!