Pre-heat a 12-inch camp Dutch oven for baking at 350 degrees (25 total coals = 17 top / 8 bottom). If you use a different oven size, check our Dutch oven temperature chart to determine the number of coals you will need. https://www.campingforfoodies.com/dutch-oven-temperature-chart/. If you are using a propane stove with a Dutch oven dome and heat diffuser plate, get it ready to bake on a level surface.
Mix the cracker crumbs with the butter and set the mixture aside.
Cook the macaroni according to the package directions for al dente consistency. You want it firm to the bite so it does not get mushy as you bake it with the cheese.
Drain the macaroni, then gently mix it in a large bowl along with the Velveeta, soup, sour cream, Parmesan cheese, milk, salt, and black pepper.
Spray the Dutch oven bottom and sides with cooking spray.
Pour the macaroni and cheese mixture into the Dutch oven and sprinkle the cracker crumb mixture over the top, cover with the lid and bake it until it is bubbly. This will take about 30 minutes. Camp Cooking Tip: Rotate the Dutch oven and lid 1/4 turns in opposite directions every 10 minutes or so for even baking.
Now, move all of the coals to the top of the oven to brown the crumb topping to a golden brown color. This will take about 5 minutes.
Remove from coals and let stand a few minutes before serving.