In the bowl of your food processor, pulse broccoli until finely chopped working in batches if needed. Empty chopped broccoli into a large mixing bowl. Add spinach, nuts, dried cranberries, and red onion.

In a small mixing bowl, whisk together honey mustard, honey, vinegar, olive oil, and a pinch of salt until smooth. Pour over salad and toss well. (Salad is best after sitting in the dressing for 15 to 20 minutes so the broccoli can soften.)