Idaho or PEI Bakers- we seldom use them any more. Always used the oven when we did.
M and M sells stuffed Idaho bakers for the microwave; the skin lacks flavor and is tough. Also the stuffing is flat. Start with a real "baker" and do it right.

have to try Bill D's method.

The thin-skinned yellows and reds don't really need pricking, the steam gets out. My wife rubs with butter, but not really necessary.