Cook elbow noodles 2 minutes shy of box directions. You want the noodles to be just shy of done, but not crunchy. Drain and allow noodles to cool.
In a large bowl, whisk together 4 cups of the milk, flour, melted butter, eggs, garlic powder, salt and pepper.
Add in the grated cheese, reserving about ¼ cup of each cheese.
Stir in cooled noodles. Pour the entire mixture into a 13x9 baking dish and sprinkle the top with remaining cheese.
Preheat the oven to 350°
Cover with foil and allow the mixture to rest for at least one hour. After the noodles have rested and absorbed some of the milk, pour the remaining 1 cup of milk on the top of the mixture.
Re-cover with foil and place in the oven for one hour, removing the foil after the first 30 minutes or until the edges have slightly browned.
Serve immediately.
