Preheat oven to 425F.
Grease a rimmed baking sheet with cooking spray and set aside.
Place a potato between 2 chopsticks.
Slice the potato into thin slices, leaving 1/4 inch at the bottom unsliced; the chopsticks will prevent you from slicing the potato all the way through.
Repeat with the remaining potatoes and transfer them to the prepared baking sheet. Set aside.
Melt butter over medium-heat in a large nonstick skillet or pan.
Add garlic and cook for 2 to 3 minutes, or until lightly browned, stirring very frequently. DO NOT burn the garlic.
Brush the prepared garlic butter over the potatoes, making sure to get in between all the slices.
Bake for 45 minutes, or until tender and crisp. Cooking time will also depend on the size of your potatoes.
Sprinkle with cheese and bake for 5 more minutes.
Remove from oven, garnish with parsley, and serve.