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For the mushrooms: Heat butter in a stove-top friendly Dutch oven or large saucepan over medium-low heat.
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Once butter is melted, add sliced mushrooms and beer.
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Simmer for approximately 8 minutes, or until all of the butter and beer has been absorbed by the mushrooms.
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4
Season with a bit of kosher salt and ground black pepper.
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Transfer to a bowl and set aside.
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6
For the pasta: Prepare the pasta noodles as per the instructions on the packaging.
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7
For the sauce: In the same vessel you cooked the mushrooms in, melt butter.
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8
Gradually whisk in flour.
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Continue to whisk until a thick roux forms.
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While whisking, add milk.
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Bright heat up a bit so the milk comes to a boil, and whisk until the roux has dissolved into the milk, thickening the sauce.
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While whisking, slowly add beer.
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Allow to simmer until the sauce thickens again.
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14
Add the shredded cheeses and stir until cheese melts.
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15
If the sauce is too thick, you can gradually add more milk as you whisk until you reach a desired consistency.
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Season with kosher salt and ground black pepper to taste.
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Transfer the mushrooms to the cheese sauce and stir.
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18
Drain the pasta once its done.
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19
Dont rinse.
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20
Carefully dump the pasta into the cheese sauce and stir to coat.
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For a slightly crispy top, place the mac and cheese under a broiler (on high) for a few minutes.
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Time varies since all ovens are different, so keep the oven light on and keep a very close eye on it.
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Note: Beer must be at room temperature.
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Cold beer may break the sauce.