Place the potato pieces in a large pot. Cover with cold water and add a tablespoon of salt. Bring the water to a boil. Then, reduce heat to medium and simmer for 20-25 minutes, until tender.

When the potatoes have about 5 minutes left to cook, warm the milk, butter, thyme, and minced garlic. Strain and set aside.

Drain the potatoes and press through a potato ricer. Add the warm milk and butter mixture. Stir until smooth. Taste and then season with salt and pepper, as needed.

Transfer to a serving dish. Top with melted butter and garnish with a sprinkle of thyme and black pepper.