2 pounds russet potatoes, peeled and cut into 1-inch cubes
Place potatoes in a large pot and cover with cold water. Bring to boil, then lower heat to simmer, uncovered for 10-12 minutes or until potatoes fall apart when pierced with fork. Drain potatoes in a colander and return potatoes to the pot. Mash potatoes until smooth. Stir in Ranch seasoning and sour cream. Serve immediately.