Ingredients

• Ingredients
  1. 2 tablespoons unsalted butter
  2. 1 medium onion, finely chopped
  3. 2 tablespoons all-purpose flour
  4. 2 cups milk
  5. 1/2 pound blue cheese such as Maytag Blue, crumbled (2 cups)
  6. Kosher salt
  7. 1/4 teaspoon cayenne pepper
  8. One 6-ounce bag thick-cut potato chips

Directions

1. In a saucepan, melt the butter. Add the onion and cook over moderate heat, stirring, about 7 minutes. Whisk in the flour and cook for 1 minute. Slowly whisk in the milk. Cook over moderate heat, whisking, until thickened, 5 minutes. Off the heat, whisk in the blue cheese and season with salt and cayenne.
2. Put half of the potato chips in a large shallow bowl and drizzle with half of the blue cheese sauce. Add the remaining chips and sauce to make another layer. Serve right away.