I wouldn’t. Copper reacts with some foods and the result could be unfortunate for the diners and perhaps for the serving dish since copper is a poison. Cooking utensils made of copper are lined with tin or stainless steel so there’s no reaction between food and copper. The dish can probably take the heat of the oven but it should not be used for heating or storing food. Decorative copper also often has a lacquer coating which should not be removed unless you want to have to polish the dish and that coating might be affected by heat.