Preheat oven to 400 degrees F. Peel the potato and cut them into preferred chunks.
Place potatoes in a pot of water, making sure the water completely covers the potatoes, and boil until you can stab a fork in it. About 7-9 minutes.
Drain and place the potatoes in a medium sized bowl. Add the oil, salt, garlic powder, rosemary, and ground pepper to the bowl. Use a spoon to combine well, making sure everything is evenly distributed.
Transfer potatoes to a lined baking tray and bake for 20 minutes. Flip the potatoes and bake for another 10-20 minutes depending on your oven and your desired level of crispiness. I take them out when they are a nice deep golden brown.
Adjust seasonings if needed and enjoy!