Preheat the oven to 450 degrees F.
Wash the potatoes with cold water. There is no need to peel the potatoes, but if they are big fingerlings, cut them into smaller pieces. Add the potatoes to a large saucepan filled with cold water.
Add salt, 3 tablespoons of butter, the thyme sprig, the bay leaves and the smashed garlic to the pot.
Bring the water to a boil and then cook the potatoes for 10 minutes over medium heat or until the tip of your knife goes through the potatoes easily.
Strain the potatoes and retain the thyme, bay leaves and garlic.
Add 1 tablespoon butter and 1 tablespoon olive oil to a non-stick frying pan. Add the potatoes, thyme, bay leaves and garlic to the pan and cook over high heat for 4-5 minutes or just until the potatoes starts to brown.
Add the potatoes to a baking sheet coated with cooking spray and roast them for 5 minute. Garnish with freshly-ground black pepper, sea salt flakes and thyme leaves. Serve immediately.