Bring milk and bay leaves to a simmer in a small saucepan. Remove from heat; cover and let stand 5 minutes. Discard bay leaves. Lightly spoon flour into a dry measuring cup; level with a knife. Place flour in a small bowl; gradually add milk, stirring with a whisk until well-blended. Return milk mixture to pan. Cook over medium heat until thick, stirring constantly with a whisk. Remove from heat. Add cheeses, salt and pepper; stirring until cheeses melt. Pour cheese sauce over pasta; stir well. Spoon mixture into a 13x9 inch baking dish coated with cooking spray.
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