Preheat the oven to 425 degrees and line a baking sheet with parchment paper.
Add the chickpeas to one side of the baking sheet and the bread to the other. Drizzle with olive oil, garlic powder, garlic salt and pepper. Toss to coat and place in the oven, on the center rack, for 10 minutes. Toss and place back in the oven for 5 minutes. Remove from the oven and allow to cool slightly.
Meanwhile, add all of the dressing ingredients to a food processor or blender. Blend until smooth, taste, and adjust the seasonings as needed.
To assemble add the brussels sprouts, chickpeas, croutons and parmesan to a large bowl. Drizzle with the dressing and toss to coat. Serve right away.
Video
Notes
I bought my brussels sprouts pre-shaved. But if you buy yours whole, use a sharp knife to slice them or an attachment on your food processor.