Do you mean jacket potatoes? In which case, brush with olive oil, add garlic salt & pepper prior to cooking.
Fillings... tuna mayonnaise, baked beans, Red Leiceister/Stilton cheese, crispy bacon, etc. Or, remove from oven after cooking, slice in half, add butter, cheese & chopped onion, toast under grill for ten minutes. Some, none, or all of the above, basically. 
For wedges/chips - veggie onion gravy, mayonnaise, hummus, guacamole, salsa, cheesy stuff, blitzed sweetcorn, American mustard, onion chutney, tartar sauce...