Step 1
Melt butter in a stockpot over medium heat. Add chopped onion, carrot, and celery. Saute until softened. Add flour. Cook for about 4 minutes, stirring often. Add chicken broth, beer, and mac & cheese noodles. Heat until it comes to a boil. Slowly add shredded cheese and mac & cheese powdered cheese packets. Continue stirring until just boiling and smooth. Add half-and-half, salt, dry mustard, cayenne pepper, and Worcestershire sauce. Reduce heat to low and cook until sauce has thickened and noodles are tender.