Place potatoes in a large pot, cover with cold water, and add salt. Bring to a boil over high heat.

Reduce heat and simmer for 15-20 minutes, or until easily pierced with a fork.

Drain potatoes thoroughly in a colander and return them to the pot.

Mash potatoes using a potato masher or electric mixer until mostly smooth. Leave some chunks for a rustic texture if desired.

Add milk, butter, and optional sour cream. Stir until butter is melted and mixture is creamy.

Stir in minced garlic, salt, and pepper. Taste and adjust seasonings as needed.

Garnish with fresh chives (optional) and serve immediately.