The best way to cook bratwurst is in the oven. This method will ensure that your sausages stay moist and juicy. You can even make them ahead of time and reheat them later.
Place the sausages on the tray. Pour the oil on the palm of your hand and rub them with the oil. Bake for about 15 minutes. Turn with tongs. Bake for another 15 minutes.
Check with a meat thermometer. The inner temperature should be 65 degrees Celsius / 150 degrees Fahrenheit and for poultry sausages should be 70 degrees Celsius / 160 degrees Fahrenheit.
If they are not done yet, give them a few more minutes and check again. The baking time greatly depends on the size of the sausages, smaller sausages might be done after 15 – 20 minutes already.