• Prepare the pasta according to package directions.

Prepare the sauce

• Pre heat your milk in the microwave for 45 seconds - just enough to take the chill out of it.
• Melt butter in a sauce pan over medium heat and let it heat until it becomes foamy.
• Mix in flour. Cook it for a minute while stirring constantly
• Slowly add warmed milk to the butter mixture 1/4 cup at a time. Whisk it continually until combined. 
• Once all of the milk is incorporated, continue to heat the sauce while stirring. Do not let it boil. The sauce is ready for the cheese when you rub a small amount between your fingers and it feels silky.
• Remove from heat and stir in your cheese and mustard until the cheese melted and mixed into the sauce.
• Once the cheese is incorporated, use a cooked noodle to taste your sauce. If it doesn’t taste cheesy enough try adding a little salt to bring out the flavor.
• Combine the pasta and sauce.