After mixed remove from heat and cover. At this time you should put your pork chops into oven and let cook for 30 minutes at 350 degrees. In 30 minutes, pour gravy over pork chops, place back in oven and cook for another 30 minutes. After 1 hour it is ready.t this time you should put your pork chops into oven and let cook for 30 minutes at 350 degrees. In 30 minutes, pour gravy over pork chops, place back in oven and cook for another 30 minutes.