I find the microwave most useful for steaming veg (in one of those microwave steamers) and making porrige.

A combined microwave/convection oven is great for jacket potatoes. Ours does convincing jacket potatoes in 30 minutes, nice and crispy because it gives the potatoes a blast with the microwave while it waits for the oven side to walm up and crispy them off.
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Remind me to change my signature to something more interesting someday