Scrub and wash the potatoes. Place them in a large pot and cover them with water.
Bring the water to a boil add the salt and let it cook for 15 minutes until the knife can easily go through.
Strain and let it cool down a little bit.
Meantime preheat the oven to 420 degrees F. Prepare the baking sheet, line with parchment paper if using and drizzle a tablespoon of oil onto it.
Have the remaining oil in a small bowl.
Place the potatoes on a cutting board and cover them with a plastic sheet. Using a potato masher or mallet hammer, smash the potatoes until they explode and flatten.
Pick the potatoes and place them on the oiled baking sheet. Brush the reserved on the potatoes and sprinkle with salt and pepper and put them into the oven.
Add the minced garlic and chopped rosemary to the remaining oil (add more oil if needed) and after 15 minutes when potatoes are golden, brush the herb-garlic oil onto the potatoes.
Roast if for another 5-8 minutes and serve.
Notes
Step-by-Step Photos: My blog post includes helpful step-by-step photos to help guide you through making this recipe.
The provided nutritional information is an estimate per serving and is not guaranteed for accuracy.