Step 1

Shred the cheddar cheese and set it aside, it should be at room temperature when you add it to the sauce.

Step 2

Melt the butter over medium heat in a small saucepan.

Step 3

Whisk in flour. Continue to whisk for 1-2 minutes, until you can no longer smell flour.

Step 4

Slowly add the milk in splashes, whisking continuously as you do so. Bring to a gentle boil, then reduce to a simmer.

Step 5

Reduce the heat to low. Gradually sprinkle in the cheddar cheese, whisking constantly as you do so. Continue to whisk until the mixture is well-combined.

Step 6

Let the sauce continue to heat over low heat, it may appear thin at first but it will continue to thicken upon standing.

Step 7

Once it's reached your desired level of thickness, remove it from the heat and serve!