To one of the prepared sheet pans, add the Brussels, butternut squash, onion, thyme, salt, pepper, and ¼ cup of the Maple Mustard Vinaigrette. Toss to combine, ensuring the veggies are evenly coated. Spread into an even layer and transfer to the lower rack in the oven. Bake for about 25 to 30 minutes, stirring halfway through, until the veggies are crisp on the edges and tender in the middle. Allow to cool for 5 minutes before assembling.