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1
Cook pasta until very firm. As a matter fact if it is undercooked is ready to be drained. Remember that is going to cook a bit more during the process. So 3 to 4 minutes in the boiling salted water should be good to go.
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2
In a small bowl, beat an egg. Keep it close, you'll be using it shortly. Promise!
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3
In a large pot, melt butter and sprinkle in the flour. Whisk together over medium-low heat. Cook mixture for 5 minutes, whisking constantly. Don't leave it to go check your Facebook quick and don't let it burn.
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4
Pour in milk, add mustard, and whisk until smooth. Cook for 5 minutes until very thick. Reduce heat to low.
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5
Take 1/4 cup of the sauce you have created and slowly pour it into the beaten egg, whisking constantly to avoid cooking the egg, I don't want scrambled egg. I just want to make it warm and cozy so it joins the pot with more comfort. Whisk together till smooth.
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6
Pour egg mixture into sauce, whisking constantly. Stir until smooth.
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7
Add in all cheeses except the parmesan and stir to melt.
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8
Add salt and pepper. Taste sauce and add more salt and pepper as needed! DO NOT UNDER-SALT (just emphasis, not screaming at you :).
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9
Pour in drained, undercooked pasta, bacon and arugula and stir to combine. Serve immediately into a baking dish.
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10
Sprinkle the parmesan, and lastly bake it for 20 to 25 minutes or until bubbly and golden on top.
