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1
Cook the macaroni according to package directions.
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2
Preheat the oven to 375 degrees.
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3
Lightly mist an 8-inch diameter (1-1/2 quart) casserole dish with spray.
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4
Using a cheese grater or food processor fitted with a chopping blade, grate the bread into fine crumbs.
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5
Add the flour and salt to a medium bowl.
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6
Slowly whisk in enough milk to form a paste.
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7
Then continue adding the remaining milk, whisking as you do, making sure to remove any lumps.
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8
Transfer the milk mixture to a medium, non-stick saucepan and place the pan over medium heat.
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9
When the milk is warm, add the cheese and stir the mixture with a wooden spoon until the cheese is completely melted and incorporated and the mixture thickens slightly.
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10
Stir in the macaroni, the transfer the mixture to the prepared dish.
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11
Place the butter in a medium, microwave-safe bowl.
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12
Microwave it for 15-30 seconds or until the better is melted.
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13
Stir in the parmesan and breadcrumbs until they are well combined and most of the crumbs are moist.
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14
Sprinkle the crumb mixture evenly over the top of the macaroni.
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15
Bake the macaroni for 15-18 minutes or until the topping is lightly browned.
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16
Remove it from the oven and let it stand for 5 minutes.
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17
Serve immediately.
