Preheat oven to 375 degrees F. Oil a large shallow glass baking dish.
Rinse and scrub the potatoes thoroughly before using. Peel the potatoes.
Place prepared potatoes on a cutting board and cut a narrow slice from the bottom of each potato; discard the slice (the potato will lay flat and not roll). Place two long handled wooden chopsticks on each side of the potato lengthwise. Use a sharp knife and slice each potato crosswise, making 1/4-inch apart slices, cutting down vertically. The chopsticks will prevent the knife from cutting entirely through the potato. As you peel the potatoes, drop them into the cold water to prevent discoloring. NOTE: Potatoes may be prepared in advanced to the above point. Place potatoes in cold water (to prevent discoloring) until ready to bake. To bake, dry potatoes well.
In a shallow bowl or pan, combine butter, olive oil, and garlic. Roll potatoes in butter mixture.
Place potatoes in prepared baking dish. Pour remaining butter mixture over potatoes. Season with salt and pepper.
Bake potatoes, basting frequently until tender and golden, about 60 to 70 minutes. Potatoes are done when the internal temperature registers approximately 200 degrees F. on your cooking thermometer.
To serve, sprinkle with Parmesan cheese just before serving.
Makes 8 servings.
* When shopping for potatoes, look for potatoes that are firm and smooth. Avoid potatoes with wrinkled or wilted skins, soft dark areas, cut surfaces, and those that are green in appearance.
If you need several potatoes for your recipe that you are making, choose ones that are similar in size for even cooking.
Garlicky Accordion Potatoes Recipe: https://whatscookingamerica.net/vegetables/garlicaccordianpotatoes.htm