Place potatoes in a large pot and cover with cold water. Bring to a boil and season with ½ tablespoon salt. Cook until tender, about 20-25 minutes. Drain and return to the pot.
Gently mash potatoes with a potato masher. Add remaining ½ tablespoon of salt, unsalted butter, warmed milk, sour cream, ¾ cheddar cheese, minced garlic, and freshly cracked black pepper. Stir until combined.
Transfer mashed potatoes to a greased oven-safe baking dish. Top with remaining ¼ cup of shredded cheddar cheese. Bake for 30 minutes, until the potatoes are bubbly and the cheese is melted.
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