Put the garlic and butter in a saucepan over a medium heat for 2 minutes until the butter has melted. Turn off the heat and add the olive oil. Remove the garlic.
Cover the potatoes with water in a saucepan and bring to the boil. They will take 10-15 minutes to become tender. Check with a fork.
Grease a baking sheet or line with reusable silicon and arrange the potatoes with a 2 inch gap in between.
Use a potato masher, or two forks, and gently press down on the potato to flatten.
Drizzle over the butter and oil mix and season with sea salt and freshly ground black pepper.
Roast at 200C/400F/Gas6 for 20-30 minutes until crisp and golden.