In the same pot you cooked the noodles in, melt the butter over low (or medium-low) heat. Once bubbling, add the salt, black pepper, garlic powder, and smoked paprika, stirring for 30 seconds to bloom the flavors. Stir in the soy sauce and Worcestershire sauce.
Turn the heat to the lowest it will go! Sprinkle in the flour and whisk continuously for about 2 to 4 minutes to cook out the raw taste. This forms a smooth roux that will thicken the sauce.- Ready when: it smells a little nutty.
Slowly pour in the evaporated milk, whisking constantly until smooth (like seriously, whip the crap out of it). Repeat with the heavy cream, whisking to fully combine.
Add three-quarters of the shredded cheese (6 cups). Stir briefly, letting it partially melt for a gooey texture.