Sour Cream Potatoes

6-8 large potatoes boiled and cubed (I have microwaved)
1 8 oz container sour cream
2 cups shredded cheddar cheese
1 sm onion diced finely and heated in microwave for 5 minutes in tablespoon of butter.
1/2 stick butter melted

Grease large casserole and mix ingredients and bake at 350 degrees for 45 minutes.

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