Piala Mac dan Keju

Bahan-bahan (15 porsi)

• 2 cups uncooked elbow macaroni
• 1 tablespoon unsalted butter
• 1 large beaten egg
• 1 ½ cups shredded sharp Cheddar cheese
• 1 ½ cups shredded mozzarella cheese
• 1 cup milk
• ½ cup seasoned dry bread crumbs
• 2 teaspoons olive oil
• ½ teaspoon salt