Preheat your oven to 430ºF (220ºC) and line a baking sheet with parchment paper. You can also use a non-stick baking sheet instead.
Slice the potatoes into ½" rounds, make sure they are dried, if you need, pat them with paper towels.
Transfer the potato slices to a large bowl, drizzle with olive oil, add seasonings, and mix thoroughly to ensure even coating.
Arrange the seasoned potato slices in a single layer on the prepared baking sheet.
Bake for 15 minutes on one side. Flip the potatoes and cook for another 15 minutes. This ensures both sides cook evenly or until the potatoes are tender, but are crisp with a golden exterior. Serve with ketchup or other sauce of your choice.
Notes
Russet potatoes are preferred for cottage fries due to their high starch content, contributing to a fluffy interior and crispy exterior. Yukon Gold potatoes have lower starch and don’t get as crispy, while red potatoes, fingerling potatoes or sweet potatoes will need adjustment of cook times and also produce a different texture.
Ensure uniform thickness while slicing the Russet potatoes. This ensures even cooking, resulting in uniformly crispy cottage fries. You can use a mandoline or a food processor as well if you have one of those.
Spread the seasoned potato slices in a single layer on the baking pan. Avoid overcrowding to allow proper air circulation, which promotes even browning.