Biscuits can get a bit tough when reheated in the oven. The microwave works well. I like to wrap up a few in a paper towel sprinkled with a few drops of water and then heat in 30 second increments until they're hot. It helps to move them around after each heating interval. If you prefer to heat them in the oven. Sprinkle a bit of water on top and wrap them up in foil. Heat in a 325° F oven until they're hot.