
In a large pan, cook macaroni according to the package direction using the lesser time-al dente.Remove the foil continue baking until browned and bubbly, about 20 more minutes. Cover with aluminum foil and bake until heated through, about 25 minutes.

Sprinkle the reserved cheddar and American cheese evenly over the pasta, then scatter the cracker mixture on top. Melt the remaining 4 tablespoons butter in a bowl in the microwave stir in the crushed crackers and parmesan.

Whisk in the milk and cook, whisking occasionally, until the sauce begins to boil and thicken, about 5 minutes. Whisk in the flour, mustard powder, Worcestershire sauce, hot sauce and cayenne and cook, whisking, until the mixture is smooth and slightly golden, about 2 minutes. Meanwhile, melt 4 tablespoons butter in a large saucepan over medium heat.Reserve 1/2 cup cooking water, then drain the pasta and rinse under cold water. Add the pasta and cook until just slightly softened, about 6 minutes.

Bring a large pot of salted water to a boil.
