With the rack at the bottom position, preheat the broiler.
In a large, deep skillet or large, thick, uncovered Presto®-style pot, toast the onions over medium heat for 15 minutes or until golden and tender. Stir constantly.
Add the beer and bring to a boil while stirring.
Add the broth and garlic sauce and bring to a boil while stirring.
Add the contents of the soup bags and bring to a boil while stirring.
Reduce the heat and simmer for 10 minutes.
Divide the soup among 6 heatproof bowls.
Place a slice of bread on each soup and cover with grated cheese.
Bake in the oven until the cheese is melted to taste.