Restaurant-Style Garlic Mashed Potatoes

INGREDIENTS

1 1/2

lbs red potatoes or 8 small red potatoes, quartered, skin left on

1 1/2 tsp

kosher salt, divided

1/4 tsp

fresh ground black pepper

1 tsp

garlic powder

1/2 cup

sour cream

1/2 cup

grated parmesan cheese

1/4 cup

unsalted butter, cut into pieces