Clean potatoes with cold water and place in a deep large pot.
Cover with cold, about 1 inch above potato level and stir in salt.
Bring to a boil on high heat, cook potatoes until fork tender.
Preheat oven to 450F.
Drain potatoes and allow them to cool in a colander to handle.
Place cooled potatoes on a large baking sheet. Using a large fork or a potato masher press of the potatoes to break them apart but keeping them intact.
Drizzle half the oil on the potatoes with a spoon then sprinkle with half the salt, garlic powder and black pepper.
Bake in the center of your oven for 10-15 minutes or until bottom is crisp.
Using a spatula turn potatoes to the other side.
Spoon remaining oil and sprinkle the remaining salt, garlic powder and black pepper on the potatoes.
Return in the oven for another 10 minutes.
Take them out and sprinkle parmesan cheese on top then return to oven one last time until cheese melts.