n a medium sauce pan over medium heat melt the better. Whisk in the flour. Remove the pan from heat and whisk in 2 tablespoons of milk until smooth. Add 2 more tablespoons and whisk.Repeat twice more, adding 1/4 cups of milk at a time until all is used.
Stir in the beer, dijon, garlic powder, salt and cayenne. Return the pan to medium heat and stir until thick and bubbling, about 2-3 minutes. Remove from heat.
Add the cheese one big handful at a time, whisking after each addition to melt it in. Taste and add more garlic, salt and cayenne if desired. Garnish with a pinch more of cayenne.
Best served hot with pita or nacho chips, pretzels or veggies.