Making the roux: It's simple to make a roux. Make sure the butter is melted before adding the cornstarch and then keep whisking it. Add the milk gradually, not all at once. And keep the heat down, so you don't accidentally burn it.
Shred your own cheese: Although optional, it's nice to shred your own, as pre-shredded cheese has starch to keep the shreds separate and these can affect how well it melts. Mac and cheese is, of course, all about the ooey-gooey cheese!
Use a disposable pan: Disposable aluminum pans are great for campfire recipes, as they're lightweight and versatile. You don't need nonstick cooking spray either, since they're disposable and don't need to be cleaned after use. Don't put a disposable pan directly on the flames though - you don't want to burn a hole through it! Hot coals are a better source of heat.
Keep the dish intact: Making this ahead and taking it to the campsite to cook? Put the prepared pan in a gallon-sized Ziploc bag and then in a cooler to stop water from getting in.
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