In a large pot over medium low heat, cook butter, onions, celery, carrot and garlic until softened.
Add flour; cook 2 minutes, stirring constantly.
Increase heat to medium, stir in beer and broth, bring to a boil and cook until slightly thickened.
Add thyme, bay leaf, cayenne pepper, paprika, mustard and cream.
Add cheese slowly, stirring constantly, until incorporated.
Remove from heat; remove bay leaf.
Garnish with chives and popcorn just before serving.
