Ingredients: 1/4 cup unsalted butter 1/4 cup all-purpose flour 1 teaspoon onion powder 1/2 teaspoon garlic powder 1/4 teaspoon cayenne pepper 1/2 teaspoon salt 1 cup beer 1 cup milk 1 cup shredded Gruyère cheese 1 cup shredded sharp cheddar cheese 1 teaspoon Dijon mustard 1 te…
