Directions
PREHEAT oven to 350° F.
PREPARE pasta according to package directions. Return to saucepan. Add butter; stir until melted.
WHISK together evaporated milk, eggs, mustard and pepper in medium bowl. Add to pasta mixture; stir. Add cheddar cheese and American cheese; stir. Cook over low heat, stirring constantly, until cheese begins to melt. Pour into 1 1/2-quart casserole dish.
BAKE for 10 minutes; stir. Bake for an additional 20 to 25 minutes or until bubbly and top is lightly golden. Season with salt.
FOR FREEZE AHEAD:
PREPARE as above; do not bake. Cover; freeze up to 2 months. Thaw overnight in refrigerator.
PREHEAT oven to 350° F.
BAKE, uncovered, stirring halfway through, for 45 to 50 minutes or until bubbly and top is lightly golden. Season with salt.