Preheat the oven to 400 degrees.
Place the cauliflower florets in a bowl and toss them with a drizzle of olive oil, a dash of salt and pepper, and 1 tsp each of chili powder and garlic powder. Place the cauliflower on one side of a large nonstick baking sheet.
To that same bowl, toss the brussel sprouts and sliced carrots with olive oil, salt and pepper and add them to the other side of the baking sheet.
Using the same bowl, toss the chopped sweet potatoes with the remaining olive oil, salt, pepper, and 1/2 tsp of chili powder and cinnamon. *Place them on a separate baking sheet as they take longer to cook.
Place the trays in the oven and set a timer for 30 minutes. When it appears that they are tender and slightly browned, take the tray with the cauliflower, carrots, and brussels sprouts out of the oven.
Bake the sweet potatoes for 10 minutes longer or until they are soft and crispy on the outside. Check the oven frequently as cooking time depends on the size of the sweet potatoes.