Heat ¼ cup of oil in a small saucepan until shimmering.
Turn off the heat and add in the garlic. Cook until lightly golden brown.
Remove the garlic from the oil using a slotted spoon; transfer to a small bowl or ramekin and set aside.
Set the oil aside to cool.
Slice the potatoes into ¼-inch planks, then fries.
Transfer the fries to a large bowl and toss with the cooled oil to coat.
Line two rimmed baking sheets with parchment paper.
Divide the fries between the baking sheets, spacing them in an even layer.
Season them generously with salt and pepper.
Bake the fries for 30 to 35 minutes or until crisp and golden brown on the exterior, rotating the baking sheets from top to bottom halfway through baking.
Remove the fries from the oven and immediately top them evenly with the remaining 2 tablespoons of oil, grated Parmesan, and reserved garlic. Toss to combine.
Transfer the fries to a serving plate.
Garnish the fries with parsley and shaved Parmesan if desired, and serve immediately.