• Prepare the pasta according to package directions, making sure to salt the water.

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.
• Stir the garlic into your butter and allow it to cook for a minute.
• 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.
• Sauté sliced red onion in a little bit of butter until they turn translucent and begin to brown.
• Top mac and cheese with onions.