Step 1

Add the butter into a medium saucepan.

Step 2

When the butter is melted and bubbling add the flour. Whisk until combined.

Step 3

Gradually add the beer, whisking constantly, until combined. Cook for a minute over low heat.

Step 4

Add the milk and spices: onion and garlic powder, Worcestershire sauce, mustard, and cayenne. Cook over medium-low heat for a minute, whisking from time to time. Reduce the heat to low.

Step 5

Add shredded cheese in 2 additions, whisking after each addition until the cheese is melted.

Step 6

When all the cheese has been incorporated, season the sauce with salt and pepper to taste.

Step 7

Leave to cool and thicken (about 5-10 minutes), then enjoy!