Preheat oven to 375 degrees
Boil macaroni noodles according to packaging (prepare them al dente), drain them and set aside
In a large bowl, add pasta noodles and melted butter, stir well
Add heavy cream, half and half, sour cream, seasoning salt, onion powder, garlic powder, and black pepper-stir well
Stir in beaten eggs and 16 ounces of Monterey Jack cheese, stir well
Stir in 8 ounces sharp cheddar cheese and mix well
Grease a baking dish with butter (or spray with non stick spray) and pour in macaroni mixture
Sprinkle remaining 8 ounces of Monterrey jack cheese over the top
Bake for 35-40 minutes or until bubbly and golden
Remove from oven and let it sit for 5-10 minutes before serving