Directions

1. Bring ¼ cup salt and 4 qt. water to a boil over high heat, adding noodles once boiling, occasionally stirring for about 9-11 minutes. (Follow macaroni box cooking instructions.) Preheat broiler with oven rack 8 to 9 inches from heat (if adding the breadcrumb & olive oil topping).
2. Meanwhile, microwave milk in a microwave-safe 1 qt. glass measuring cup covered with plastic wrap at HIGH three minutes. While milk is heating, melt butter in a 12-inch cast iron skillet over medium heat.
3. Reduce heat to medium-low; add flour, and cook, whisking constantly, 2 minutes. Gradually whisk in hot milk.