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Yet there are some out there. As I mentioned in an earlier reply, Red Baron frozen French Bread Pizzas have no microwave instructions (though people may try it anyway, idk), and either does Stouffer's family sized Chicken Alfredo (except for their sped-up hybrid instructions).

You can absolutely put aluminum in a microwave. Get a smooth aluminum container with no sharp edges or ridges and fill it with food then put it in the microwave. If it does anything except heat up the food I will eat my shirt.

I'd be curious to know how the market is for frozen dinners designed to be microwaved on/in a separate plate/bowl. I usually do that anyway for things that come in plastic microwavable containers