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Preheat oven to 350
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Cook pasta according to package directions until al dente
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In a large Dutch oven melt the butter over medium-high heat
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Add flour and whisk until smooth and starts to turn light brown in color, 1 - 2 minutes
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Slowly whisk in milk
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Slowly whisk in beer
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Cook over medium high heat another couple of minutes until mixture is smooth and thickens
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Stir in all the cheese except the reserved parmesan and continue stirring and cooking until all the cheese melts
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Add pasta to the cheese mixture and stir until all the pasta is coated completely
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Transfer pasta and cheese sauce to a casserole dish coated with cooking spray
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Top with reserved parmesan and bake for 25 - 35 minutes until top is golden