Place potatoes in a large pot and cover with cold water, up to 1 inch on top of the potatoes. Add a pinch or two of salt to the water, then bring to a boil over high heat.
2.5 pounds Yukon gold potatoes
Once boiling, reduce to medium heat and cook for 15-20 minutes. The potatoes are done when they can be easily pierced with a fork.
While the potatoes are cooking, melt the butter in a small skillet over medium heat. Once the butter melts, watch for the milk solids to turn a light brown on the bottom of the pan - this is browning the butter.
2 tablespoons butter
Once the butter is browned, add the minced garlic and thyme and sauté 1-2 minutes, until garlic is crispy and a dark golden color. Turn off the heat and set this garlic thyme butter aside.
3-4 cloves garlic, 1 teaspoon thyme leaves
When the potatoes are fork-tender, drain and then return to the pot. You can use an electric masher or potato ricer for a finer mashed potato, or just use a handheld masher for a more rustic mashed potato.
Add the milk, Greek yogurt, salt, pepper, garlic thyme browned butter, and shredded asiago cheese to the mashed potatoes and mix until combined.
1/2 cup milk, 1/2 cup Greek yogurt, 1/2 cup asiago cheese, 1/2 teaspoon salt, 1/2 teaspoon black pepper
Transfer to a serving bowl and garnish with melted butter, shredded asiago, and fresh thyme. Enjoy!