Classic Potatoes Au Gratin

Classic Potatoes Au Gratin was pinched from <a href="http://www.kraftrecipes.com/recipes/classic-potatoes-au-gratin-54341.aspx" target="_blank">www.kraftrecipes.com.</a>
INGREDIENTS
1/4 cup (1/2 stick) butter or margarine
1/4 cup flour
1 tsp. salt
1/2 tsp. dry mustard
1/4 tsp. pepper
2-1/2 cups milk
1 pkg. (8 oz.) KRAFT Shredded Cheddar Cheese, divided
2 Tbsp. chopped onion
6 cups thinly sliced peeled potatoes (about 6 to 8 medium)
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