Step 1
In a large bowl, toss the two cheddars with the flour and garlic powder and set aside.
Step 2
Set a fondue pot over medium-high heat, add the beer, and bring to a simmer. Whisk in the mustard and Worcestershire sauce, then gradually add the cheese-flour mixture while stirring. Turn the heat down to low and continue stirring until the cheese is melted and the fondue is very smooth, about 5 minutes. Remove from the heat, then season to taste with salt and freshly ground black pepper. Set the fondue pot over a tealight or sterno flame and serve with breadsticks, crusty bread, smoked sausage, and roasted potatoes, for dipping.