For the Taylor Street cheese sauce: Set a medium saucepan on low heat. Add the evaporated milk, Dijon and hot sauce and whisk together until uniform and smooth. Toss the grated cheeses, Gorgonzola and cornstarch together in a bowl until totally coated. Whisk the cheese into the saucepan and heat, stirring constantly, until all the cheese is melted and the sauce is silky and smooth, about 5 minutes.
For the cheesesteaks: Preheat the oven to 350 degrees F.
Brush the sub rolls all over the outside and inside with the oil and set them on a sheet pan. Bake until lightly toasted, about 5 minutes.
Heat a large nonstick skillet over high heat. Add the oil and the meat in a nice even layer. Season with the garlic salt. Now, don't move the meat. Let it get a nice crispy crust, 2 to 3 minutes. Using tongs, flip the mound of meat to give the top of the pile some heat exposure. Top with a few ladles of the cheese sauce. Mix it around a bit until the succulent cheese and the crispy meaty bits all marry into one homogenous nebulous mass, then take off the heat immediately to preserve all that juiciness! Divide the meat among the rolls, stuffing each roll to the brim. Top with additional cheese sauce, some sliced roasted red peppers and crispy fried onions. Serve with some BBQ chips, a cheesesteak bib and about 6 cold light beers.