4 pounds Yukon gold, cut into 1/3rd’s
8 garlic cloves, peeled and halved lengthwise
1 teaspoon salt
3 tablespoons unsalted butter
2 tablespoons extra-virgin olive oil
1 1/4 cups milk or half-and-half
Salt and freshly ground white pepper
Boil the potatoes, garlic, and salt until the potatoes and garlic are fork-tender. Drain the potatoes and garlic and return to the pot over high heat. Cook, tossing the potatoes, for 1 to 2 minutes, or until all the moisture is evaporated. Transfer to a large bowl and mash with a potato masher.
Meantime, in a medium saucepan, heat the butter, oil, and milk over medium heat until the butter has melted.
Add to the potatoes and whip with a wooden spoon or whisk to a smooth but not soupy consistency. Once the the liquid is absorbed, season with salt and pepper to taste. Transfer to a serving bowl and serve immediately.