1/4 cup all-purpose flour
2 1/2 cups 1% low-fat milk
1/2 cup (3 ounces) shredded guyere
2 ounces Alpine Lace American cheese
1/2 cup shredded monterey jack cheese
1/2 cup (2 ounces) shredded extra-sharp light cheddar cheese
6 cups cooked elbow macaroni (about 3 cups uncooked)
1/4 teaspoon salt
1/3 cup panko
Preheat oven to 375°.
Lightly spoon flour into a dry measuring cup; level with a knife. Place flour in a large saucepan. Gradually add milk, stirring with a whisk until blended. Cook over medium heat until thick (about 8 minutes), stirring constantly. Add cheeses; cook 3 minutes or until cheese melts, stirring frequently. Remove from heat; stir in macaroni and salt.
Spoon mixture into a 2-quart casserole coated with cooking spray. Top with a little extra cheddar cheese and the panko. Bake at 375° for 30 minutes or until bubbly.