Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper for easy cleanup.
Wash and chop the sweet potatoes into roughly 1-inch cubes. Break the broccoli into bite-sized florets, trimming the thick stems when needed.
In a large bowl, toss the sweet potatoes with 1 tablespoon of olive oil, a pinch of salt, and a little pepper. Spread them on the baking sheet in a single layer.
Roast the potatoes for 15 minutes.
Meanwhile, in the same bowl, whisk together maple syrup, soy sauce, Dijon mustard, cumin, garlic powder, the remaining tablespoon of olive oil, and a pinch of pepper.
After the potatoes have roasted for 15 minutes, toss in the broccoli florets with the remaining oil and a pinch of salt. Return the sheet to the oven.
Roast for another 12–15 minutes, until the broccoli is bright green and the potatoes are tender.
Remove from the oven. Drizzle the maple glaze over the hot vegetables and toss gently to coat. If you like a slightly sticky finish, return to the oven for 2–3 more minutes.
Taste and adjust with a little more maple or soy if needed. Serve warm.