Add all pasta ingredients except for noodles to slow cooker.
Cover and cook on high for 3-4 hours or low for 6-8 until meat is cooked through.
Stir in pasta noodles and return slow cooker to high for 15-45 minutes until liquid is absorbed and noodles are al dente (add more liquid ¼ cup at a time if needed).
In the meantime, melt butter in saucepan over medium high heat.
Whisk in flour until smooth.
Slowly whisk in beer and let simmer for 2-3 minutes.
Slowly stir in milk while continuing to whisk and then let simmer while whisking occasionally until thickened (about 4-6 minutes).
Stir in cheese and remove from heat.
Add salt and pepper to taste if desired.
Stir cheese sauce into finished pasta and serve.
