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 until it’s 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.