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In a saucepan, melt butter over MED heat. Add flour and whisk until combined. Cook 30 seconds, while whisking occasionally.
Add beer, whisking continuously as you pour, eliminating any lumps from the flour mixture. Slowly add in milk, whisking as you pour.
Cook over MED heat, whisking often, for several minutes, until mixture has thickened. Stir in mustard, Worcestershire sauce, garlic powder, salt, pepper, and cayenne.
Add cheese, a handful at a time, and stir until completely melted. Serve warm.