Add potatoes to a large pot and pour in cold water enough to cover the potatoes by 1-inch. Salt, then bring to a boil. Reduce heat and simmer until the potatoes are tender, but not saturated or crumbling, 20-25 minutes.
4 pounds Yukon Gold potatoes, 1 Tablespoon Kosher salt
Drain the potatoes, reserving ½ cup of the water if you're making the potatoes ahead of time. Return the potatoes to the pot and set it over low heat. Gently stir until the potatoes are dry, about 1-2 minutes or until the moisture is gone.
Heat milk, thyme, bay leaves, garlic, and butter in a small saucepan over medium heat until the butter melts. Then remove from heat.
1.5 cups Whole milk, 2 cloves garlic, 5 sprigs Fresh thyme, ¾ cup Unsalted butter, 2 Dried bay leaves
Run hot potatoes through a ricer over a large bowl. Do this while the potatoes are hot - if they cool, the potatoes will become gummy. If you don't have a ricer, transfer to an electric mixer with the paddle attachment and blend until a creamy consistency is reached.
Remove the herbs from the warm milk mixture. Gradually add the milk to the potatoes, stirring with a wooden spoon or paddle attachment on a mixer until combine and creamy.
Season with salt and pepper, and serve with extra butter on top plus chives if desired. Enjoy!