Created by lillyindy on June 9, 2015
Step 1: In a medium sauce pan, melt butter over medium-high heat.
Step 2: Slowly whisk in 1/2 cup flour and stir continuously. Let bubble for 2 minutes while stirring with a whisk.
Step 3: Pour in 2 cups milk and whisk for 1 minute on medium heat until it thickens.
Step 4: Turn heat to low and stir in shredded cheese.
Step 5: Season with ground mustard, salt, pepper, and onion powder. Stir until mixed well and cheese is fully melted.