Fill a medium pot with the salted water and bring to a boil. Add the elbow macaroni and cook per the package instructions until al dente.
4 Cups Water, 2 Cups Elbow Macaroni
Drain the noodles and set aside.
While the noodles are cooking, in a cast iron skillet (medium), add the butter and apply medium heat to melt the butter.
⅓ Cup Unsalted Butter
Add the flour and stir frequently for a minute or two until the flour has blended with the butter well.
⅓ Cup All Purpose Flour
Slowly pour in the heated milk, a little at a time, continuously stirring. In the beginning it will all stick together and be paste like but toward the end it will start to thin out and become more sauce like.
2 Cups Whole Milk
Add 2 cups of the grated Colby cheese and stir until melted.
2-½ Cups Colby Cheese
Add the salt and pepper and the nutmeg. Stir into the sauce and taste to check for seasoning.
1 Pinch Nutmeg, Salt and Pepper to taste
Slowly fold the cooked elbow noodles into the cheese sauce and when mixed top with the remaining colby cheese.
Place under a hot broiler for a minute or 3 until slightly golden brown.
Remove and sprinkle with chopped parsley.
1 teaspoon Fresh Parsley
Notes
Do not rush when adding the milk. If you pour in the milk too fast you may end up with a lumpy sauce.When reheating, if you find the mac and cheese has dried out a little add a tablespoon of butter or milk to loosen it up while reheating.