Combine cheeses in a bowl with flour. Add beer to a small pot and bring up to a bubble over medium heat. Reduce the heat to simmer and add cheese in handfuls. Stir constantly, melting the cheese in batches.

Combine cheeses in a bowl with flour. Add beer to a small pot and bring up to a bubble over medium heat. Reduce the heat to simmer and add cheese in handfuls. Stir constantly, melting the cheese in batches.