Wash and scrub even-sized, shapely baking potatoes; dry.
Grease lightly with butter.
Bake in 400°F oven 40 minutes to 1 hour, depending on size.
When half done, pull out rack; quickly puncture skin once with fork, permitting steam to escape.
Return to oven; finish baking.
When done, serve at once with butter, sour cream, chopped chives or parsley, chopped bacon or ham, or grated cheese.