1tablespoonall-purpose flour or 1 teaspoon cornstarch
1/8teaspoonkosher salt and a few turns of the pepper mill
1/2cupmilk (I prefer 2% milk but have used nonfat with good results)
3ounces(about 3/4 cup) shredded Cooper sharp cheese
Instructions
Melt the butter in a saucepan over medium heat. (Watch carefully. Once melted, the butter will brown quickly. Lower the heat to medium-low if starting to brown or if making a half batch.)
Add the flour or cornstarch and whisk or stir for about 1 minute over medium heat—the mixture should be simmering. Slowly whisk in the milk, and then add the salt and pepper.
Cook, stirring regularly, until slightly thickened, about 4 minutes. Remove from the heat, add the cheese, and stir until melted and smooth. Serve immediately.
Notes
Upon cooling, the cheese sauce will thicken and develop a skin on top. Simply reheat over low heat (or in short bursts in the microwave), stirring regularly, to bring it back to saucy perfection.