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I think the issue is that the temperature during the warm-up period isn't predictable. Different ovens will heat up at different rates. And since you'd be starting at room temperature and getting to target temp in 5 minutes, you'd probably need to add more than 5 minutes to the total.
Actually, I think frozen and other heat-and-serve meals are very forgiving and you can probably get away with the one-step process and not harm the quality of your meal.
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