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 added, cook for a few minutes while whisking it. Do not let it boil. You will feel the sauce start to thicken. It's ready for 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.
Combine the pasta and sauce.
Parmesan Chips
Pre Heat a skillet on medium heat.
Sprinkle 1 tablespoon grated parmesan onto the hot skillet.
Heat the parmesan until it starts to brown and flip using a spatula.
Remove the parmesan crisps from pan onto a paper towel lined plate.
Repeat with the remaining parmesan cheese
Plate your food
Plate the mac and cheese and top it with two parmesan crisps per person and chopped green onions.