8 med. potatoes, peeled and cut into eighths
1 med. onion, finely chopped
1/2 to 3/4 c. milk, divided
1/3 c. butter
1 tsp. Parmesan cheese
1 tsp. salt
1/4 tsp. sugar
1/8 tsp. pepper

Cook potatoes and onion in boiling water to cover, 15 minutes or until tender. Drain and mash. Add 1/2 cup milk and remaining ingredients. Add more milk, if needed.