Place potatoes and garlic in 2-quart saucepan; add enough water to just cover potatoes.
Heat to boiling, reduce heat. Cover and simmer 20-30 minutes or until potatoes are tender; drain.
Return to pan and keep on low heat (to dry potatoes and make them fluffier).
Mash potatoes in the pan over low heat until no lumps remain.
Add 1/2 cup milk, butter, sour cream, green onion, salt and pepper.
Mash vigorously until potatoes are light and fluffy (add remaining 1/2 cup milk if they seem to dry).
Nutrition Info Per Serving: Calories 323.4 Total Fat 12.5 g Saturated Fat 7.9 g Polyunsaturated Fat 0.6 g Monounsaturated Fat 3.2 g Cholesterol 32.0 mg Sodium 120.4 mg Potassium 1,231.4 mg Total Carbohydrate 48.0 g Dietary Fiber 7.1 g Sugars 3.9 g Protein 6.3 g