Whisk milk, eggs, sour cream and seasonings together. Set aside.
Shred your cheeses. Set aside.
When the macaroni is done, drain and put macaroni back in the pot.
Stir in butter until melted. Add in 1 cup of the sharp cheddar and 1 cup of the Colby Monterey Jack cheese. Stir until melted and you see the cheese pull looking stringy.
Add in your milk, egg, sour cream mixture and mix well.
Add in 1/2 cup gouda cheese and mix well.
Grease pan. Pour half mixture in pan. Top with half of each cheese. Pour remaining mixture on top. Top with 1/2 of remaining sharp cheddar cheese and remaining of other cheeses. Add a little sprinkle of parsley flakes(optional). Bake for about 20 minutes. Just to let it set a little.
Take out the oven and sprinkle remaining sharp cheddar cheese on top. If you have more or want more cheese, add it now. I like to add a little sprinkle of paprika for more pop of color here but that's optional. Bake for another 15-20 minutes.
Enjoy!
Video
Notes
Additional tips and suggestions are within the reading above.