Grilling is usually the preferred method for cooking beef ribs, but ribs can also roast in a 300-degree Fahrenheit oven for two to three hours, depending on the type of ribs. Sunny Anderson suggests covering seasoned beef short ribs tightly with aluminum foil and roasting for 2.5 hours.
The Kitchn recommends a similar, but more complicated technique to cook tender baby back and spare beef ribs in the oven. The ribs are broiled for about five minutes, and then roasted for about three hours. Baby back ribs cook faster than spare ribs and roast for about two hours. The beef is left uncovered until the last hour or hour-and-a-half of cooking time.
With either method, the beef ribs are prepared with a dry rub at least an hour before cooking and are brushed with a sauce or glaze during the last half hour.