A microwave is an incredibly useful kitchen appliance — and for some people, such as college students and urbanites living in small apartments, it's the only method of heating and cooking food.

When I was a kid, one of my go-to fend-for-myself meals was nachos. Heap tortilla chips, refried beans, olives, meats, cheeses and whatever else struck me onto a giant dinner plate. Sprinkle a most ...