Nacho Cheese Sauce

INGREDIENTS:

2 tablespoons butter
2 tablespoons all-purpose flour
1 cup milk
7 slices processed American cheese
½ teaspoon salt

DIRECTIONS:

Melt butter in a medium saucepan over medium heat. Whisk in flour until a paste forms. Pour in milk and stir until mixture thickens.
Add cheese and salt; cook and stir until cheese has melted, about 15 minutes.