Place brussels sprouts on a baking sheet and drizzle with olive oil, salt, and pepper. Flip brussels sprouts so they are all cut side down on the baking sheet. Bake at 350 degrees for 30-35 minutes.
In a small bowl, whisk together maple dijon dressing ingredients. (Alternatively you can put them all in a small mason jar and shake until combined.)
Drizzle the maple dijon dressing over the roasted brussels sprouts on the tray and toss to combine.