Bake fries according to the package, until it's crispy.
While fries is baking, sauté mushrooms and onions with a little bit of salt and pepper, until onions are golden brown. Add pulled pork and sauté onions, mushrooms and pork together for a few minutes.
Once fully baked, lay out fries in an oven-safe serving dish (skillet, or baking wish), spreading it evenly, top it off with pulled pork mixture. Top it off with shredded cheese and put it back in the oven until cheese is melted. (You can also set it under broil.)