Boil potatoes until they are fork tender.
On a sheet pan, generously drizzle olive oil. Place potatoes on cookie sheet, then gently press with a potato masher until it mashes slightly. Rotate masher 90 degrees and repeat.
Brush each potato with olive oil. Sprinkle with salt, pepper, and rosemary.
Bake in a 450 degree over 20-25 minutes or until golden brown.
Can also be served for breakfast – cook sausage, eggs, and tomatoes in the same pan.