Dice 1 large sweet potato and place on one half of a baking tray. Chop 1 medium head of broccoli into florets and place on the opposite side of the tray. Peel 1 red onion, chop into chunks and scatter through the broccoli.
Drizzle everything with olive oil, season with salt and pepper and toss to coat.
Bake for 20-25 minutes or until just tender, stirring halfway through. Serve immediately, or allow to cool and separate if you are meal prepping.