Soak the potatoes in for a few minutes, scrub very well and rinse under running water. Place the clean potato in a colander and removed sprout areas if there is any.
Place the potatoes in a large pot filled with water make sure the potatoes are submerged. Season with salt, cover, and ring to a boil over medium-high heat. Cook until you can easily pierce the with a fork, it takes about 20 minutes it might take about 5 minutes longer if you're using medium size potatoes.
While the potatoes are cooking preheat the oven to 400 degrees F. Grease a baking sheet with oil and set aside. When the potatoes are done, drain, and allow them to cool down in a colander.
Transfer the cooked potatoes to the greased baking sheet. Use a fork, or a potato masher to gently smash the potatoes, the thinner the crispier.
Mix the parsley, rosemary, garlic powder, onion powder, salt, and pepper in a small bowl.
Drill oil over the potatoes and season with the garlic mixture making sure the potatoes are spread out on the baking sheet.
Bake in the preheated oven until golden brown or to the texture you desire. About 20-25 minutes depending on the the size of the potatoes.
Voila, your crispy smashed potato is ready!
Serve and enjoy with your favorite side dish.