The first is to preheat your oven, and make sure your oven is at the right temperature by investing in an oven thermometer. Second, the mix of oil and sweet maple syrup will work as a team for even browning and caramelization. Finally, DON’T CROWD THE PAN. You want to make sure there is plenty of space for airflow, otherwise the vegetables will end up steaming each other as they cook. If you have too much for one pan, roast two pans as near the middle of the oven as you can, then rotate the pans (up to down, down to up, and back to front) halfway through cooking.