"ALL the Above" works for us!

But the Micro-ZAPPER is the Quick Way.

From past, sad experience -
Go easy with the microwave, though...

LOW Power setting;
and only a Quick, BRIEF, zip!...
NOT a long, hard ZAP!

High Power, or a Loooong Zap, will turn the crust into a
*rubbery*, *chewey*, *limp* mess!

Also helps to put the slices ON a paper towel,
and lay one on TOP of the slice, too -
the paper towels absorb the excess moisture -
and help prevent the "rubbery" texture.