Mashed Potato Patties

Ingredients
Leftover mashed potatoes (about 1 quart)
1 onion, diced
1 egg
1 cup cheese, grated
Flour
butter
Salt and pepper

Directions
1. Combine mashed potatoes, onion, egg and cheese. 
2. Shape into large size balls. 
3. Roll into flour and flatten into patties. 
4. Melt butter in frying pan and brown for about 5 minutes on each side. 
5. Salt and pepper to taste.