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Submitted by: Lisa Quick from Clarksburg, Maryland
Originally shared on the web 04/02/2010

2 T. onion, chopped
1/4 c. butter
1/4 c. all-purpose flour
1/2 t. dry mustard
1 t. salt
1/8 t. pepper
1-1/2 c. milk
2 c. shredded Cheddar cheese, divided
6 c. potatoes, peeled, cooked and sliced
1/2 lb. cooked ham, cubed

In a skillet over medium heat, sauté onion in butter; blend in flour, mustard, salt and pepper. Gradually add milk, stirring constantly until thickened; mix in 1-1/2 cups cheese and stir until melted. Remove from heat; add potatoes and toss to coat. Spoon into a greased 13"x9" baking pan; arrange ham and remaining cheese on top. Bake, uncovered, at 350 degrees for 30 minutes, until hot and bubbly. Serves 6.