Preheat your oven to 375°F (190°C) and grease the bottom and sides of a baking dish or cast iron pan with butter. Set it aside.
Slice the Potatoes
Using a mandoline or food processor, slice the potatoes very thinly (about ⅛ inch thick). This ensures they cook evenly and become crispy.
Soak the Slices
Place the sliced potatoes in a bowl of cold water and soak for at least 30 minutes to remove excess starch. Drain and rinse the slices, then pat them dry with paper towels.
Mix the Ingredients
Transfer the sliced potatoes to a large bowl. Add olive oil, Parmesan cheese, minced garlic, Italian seasonings, salt, and pepper. Toss everything together until the potato slices are evenly coated.
Arrange the Potatoes
Layer the potato slices into stacks and arrange them vertically in the prepared baking dish or pan. This helps them crisp up and cook evenly.
Bake
Bake the potato slices uncovered for 50-60 minutes, or until the edges and tops are golden brown and crispy, while the centers are tender.
Garnish and Serve
Once baked, sprinkle with crispy bacon bits, sea salt, fresh thyme or fresh parsley if desired. Serve immediately and enjoy your perfect crispy oven-baked potato slices!
Notes
Select same medium size potatoes for a perfect result.
Use a mandoline to cut uniform thickness slices.
Soaking sliced potatoes in cold water for at least 30 minutes before baking can help remove excess starch, resulting in crisp exterior and creamy centers.