Saute onion in 1/4 cup butter in a skillet until tender. Stir in flour. Gradually add milk, salt, pepper, and mustard. Cook, stirring constantly, until smooth.
Cook over med. heat until thick. Add cheese. Stir until melted.
Combine with ham and potatoes.
Bake at 350 degrees for 45 mins. or until potatoes are tender.
Originally Submitted
8/24/2012
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