Preheat oven to 425°F If using a glass casserole, reduce oven temperature to 400°F.
Prepare the vegetables: peel the butternut squash, remove seeds/pulp and cut into bite-size pieces; wipe the mushrooms clean and leave whole, cut the broccoli crown into pieces, peel or scrub the large carrots, and cut into 2-3" pieces.
In a large bowl, combine the olive oil, the juice of one lemon, garlic powder, coriander, pepper, salt, and raw sugar. Toss cut vegetables to coat with the olive oil/lemon juice mixture.
Spread the vegetables in a single layer, in a 10x15 pan with shallow sides, or any large casserole to accommodate a single layer of vegetables. NOTE: If using a glass casserole, please reduce the oven temperature to 400°F.
Roast uncovered for 15 minutes. Turn vegetables over, and continue to roast for another 10 minutes.