The BEST Thanksgiving Mashed Potatoes: Caramelized Onion + Boursin

Claire on Instagram: "Creamy Thanksgiving Mashed Potatoes 🦃🥔 These are the best mashed potatoes I’ve ever had. Here’s how to make them: - 3lbs yukon gold potatoes - 1/2 - 1 cup high-quality butter, room temp (to taste, but a good rule of thumb is adding 1/3 cup butter for every lb of potatoes) - 3/4 cup whole milk, warmed - 2 cloves grated garlic, to taste - 1 (5.3oz) pack @boursincheese - Salt to taste - Sour cream to taste, optional (~1/2 cup) - Chives and butter to garnish 1. Set your milk,