Yes!
Hadley pie plates, porringers, casseroles, and other baking dishes are oven-usable with reasonable care. Avoid the risk of thermal shock by following these simple guidelines.
To avoid the risk of heat shock:
Never transfer stoneware directly from the freezer to the oven. Thermal shock will likely result, damaging or ruining your stoneware.
Place room-temperature item and contents in a room temperature oven and bring up to desired temperature gradually.
Do not place Hadley Pottery in direct contact with flame or electric heating element.
Do not use in a broiler