Created by Sue Lau on March 3, 2013
Step 1: In a large micro-wave safe glass bowl, heat butter for 50 seconds on high or until the butter is melted.
Step 2: Whisk together the butter, flour and milk.
Step 3: Add shredded cheddar cheese, adjusting amount to how thick you like it.
Step 4: Place bowl in microwave and cook on high for 1 1/2-2 minutes, whisking every 30 seconds or so, until sauce is thick and heated through.
Step 5: Season with salt, if desired, and whisk until blended.