I voted to close it as off-topic.
It could indeed be an interesting question, after some editing. But it hasn't been edited—and remember closing is not permanent. Its not only acceptable but encouraged to edit your closed question to fix the problems, then ask for it to be re-opened. Closing is on the pathway to deletion, but only if the problems aren't fixed.
So, yes, OP could edit the question to ask, "How can I shield part of what I'm microwaving, to prevent it from cooking as much?" I'd not vote to close that, and were it closed, I'd vote to re-open. That's the kind of question a cook would know the answer to (if there is one).
Someone else could edit it—but we seem to be discouraging that kind of editing.
As it stands now, answers would have to talk about blocking microwaves, heat conduction, arcing, etc. (Because every cook would just not plate the salad until after heating the chicken—there is even a nice picture to show how silly it'd be for a cook to do it that way.) In fact, the answers do talk about things like that. That's not a question for a cook, it's a question for a physicist. But we already know physics.SE doesn't want it (and, if I remember correctly, migrating a question twice breaks things anyway).
Physics.SE decided not to have fun talking about weird microwave contraptions. But instead of doing something reasonable (closing as NARQ), they migrated it to us. One of their mods needs to be reminded to only migrate questions that'd be a good question on the target site.