Preheat the oven to 350°F. Spread the chopped walnuts on a baking sheet and toast in the oven for about 8-10 minutes, or until golden and fragrant. Keep an eye on them to prevent burning.
In a large bowl, combine the chopped kale, cooked farro, halved cherries, diced avocado, and toasted walnuts.
In a small bowl, whisk together the olive oil, balsamic vinegar, honey, salt, and pepper until well combined.
Pour the dressing over the salad and toss gently to combine, ensuring all ingredients are coated.
If using, sprinkle the crumbled feta cheese on top before serving.
Serve immediately or let the salad sit for about 10 minutes to allow the flavors to meld.