Preheat oven to 375℉.
Spray a standard 12-cup muffin pan with cooking spray or brush on a thin layer of oil.
Mix olive oil, nutritional yeast flakes, garlic powder, rosemary, and salt together in a small bowl. Set aside.
Scrub potatoes and slice the potatoes into rounds about ⅛-inch thick, using a mandoline for best results.
Place potatoes in a casserole pan and brush both sides with the olive oil mixture using a pastry brush.
Stack potatoes into the muffin pan, filling them.
Bake for 40-45 minutes or until the edges are crispy and golden.
Remove stacked potatoes using a spoon and place them on a serving platter.