•In a large saucepan, melt butter. Whisk in flour until smooth; gradually add milk. Bring to a boil over medium heat; cook and stir for 1-2 minutes or until thickened. Reduce heat; stir in cheese until melted. Remove from the heat. Beat egg yolks. Stir a small amount of hot mixture into yolks; return all to the pan, stirring constantly. Cool slightly.
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