Whisk the dressing ingredients together. Taste to adjust anything.
Cook the rice according to the package directions. I like to cook it just until it's tender but still has a bite to it, so check it before the allotted time. Put it in a large bowl to cool.
Toss the sweet potato and the blue potatoes in a little olive oil, and season with salt and pepper. Spread out on a baking sheet. Do the same with the Brussels sprouts on another sheet and roast for about 15 minutes or until just tender and starting to caramelize. The Brussels sprouts may take longer.
Toss the rice with half of the dressing to moisten. Add the rest of the ingredients and toss with the rest of the dressing. Top with cheese crumbles and add salt and pepper to taste.