Preheat oven to 425°; chop cauliflower into 1-inch pieces, spread on a sheet pan, drizzle with 2 tbsp oil + season with salt/pep; roast 10 min, then flip veggies over + roast 5-10 min more until browned + tender; divide to bowls

Meanwhile, microwave 2 sweet potatoes in their wrappers on high, 6-8 min, flipping halfway through (caution, that's a hot potato!); scoop flesh, mash using a fork + season with salt/pep (add butter if desired); divide to bowls

Heat 1 tbsp oil in skillet over med-high + cook brussels with salt/pep 4-6 min until tender, stirring minimally to ensure browning; divide to bowls

Drizzle each bowl with 2 tbsp dressing