Rustic Cheesy Potato Soup

This is a great weeknight soup because its fast but satisfying. 

Melt one stick of butter in a large pot. Finely dice 1 medium onion and add to the pot with a dash of salt and pepper. Saute for 2-3 minutes. Meanwhile shred 4 medium potatoes. Add 4 tablespoon flour to the pot and mix well. Then add 2 cups of chicken stock and simmer until flour is absorbed. Add 6 cups of milk. Add shredded potatoes and simmer about 10 minutes until potatoes soften. Add 3 cups shredded cheese or velveta and stir until melted. Add salt and pepper to taste. Top with a dollop of sour cream and a sprinkle of zesty seasoning salt. Yum!