Boil potatoes until soft

While potatoes are cooking melt butter in large pan over medium-high heat

Whisk in flour until smooth

Gradually stir in milk, bring to boil the reduce heat to medium

Simmer for 5-10 minutes or until slightly thickend

Stir in potatoes, onion and cook for 5 more minutes

Stir in sour cream and cheddar cheese and blend well

Season with Salt and Pepper

Recipe can be cut in half