Peanuts can be roasted in the shell or unshelled. In both cases the oven should be set at 350 degrees. Peanuts in the shell should be placed one or two layers deep in a shallow baking pan. While roasting for 25 to 30 minutes the peanuts should be stirred occasionally. In order to check for doneness, shell and sample a few peanuts during the last few minutes of cooking.
Shelled peanuts should be placed one layer deep in shallow baking pan and cooked for 15 to 20 minutes, until golden brown. If you wish, pour melted butter over the peanuts and salt them lightly.