For oven roasting, I remove the husks. It makes it easier to apply the flavored butter to the kernels. But, if you want to keep them on, you can carefully turn back the husks, and apply the flavored butter. Then, close up the husks again and bake. Or, you can skip the flavored butter and simply roast the cobs plain with the husks on. Then, apply butter, fresh herbs, and seasonings when you take them out of the oven.