Cobbler can be reheated in the microwave or oven. To reheat in the oven, cover the oven-safe dish with foil and then bake it at 350 degrees F until the filling is bubbly and the top is warm. This should take about 20 minutes. To reheat in the microwave, place a serving in a microwave-safe bowl or on a microwave-safe plate. Then heat in the microwave at 30-second intervals until it reaches your desired warmness.