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Au Gratin Potatoes

Au Gratin Potatoes was pinched from <a href="http://www.spendwithpennies.com/au-gratin-potatoes/" target="_blank">www.spendwithpennies.com.</a>
INGREDIENTS
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2.5 lbs red potatoes
1 onion
3 tablespoons butter
3 tablespoons flour
1 teaspoon dry mustard
2 cups milk
1 cup cheddar cheese
1/2 cup gruyere cheese
salt & pepper to taste
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