A nifty trick that would work for your microwave cooking technique is to take a plug out, through the length of the potato center. An apple corer will do the job. Cut the plug in half. Fill the whold with any number of fillings, from ham and cheese, to shredded roast beef and duxcelles. Yu can fill it with uncooked mushroom soup, or mushrooms and butter, or compound butter, or seasoned ground beef, with whatever your imagination can create. Then microwave it. By the time the potato is done, the filling will likewise be done.
Oh, after you put the filling into the whole, push the plug halves in from both sides.
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