After cooking the noodles according to pkg directions, pre-heat oven to 375 degrees F.
In a small sauce pan, melt the butter over medium heat.
Stir in the flour and cook 1 minute.
Add the farmers cheese, mild cheddar, Parmesan and milk.
Turn heat to low and stir occasionally until all the cheese is melted and smooth.
In a 1.5 ~ 2 quart casserole dish, combine the noodles and the cheese sauce.
Top the dish with the shredded sharp cheddar.
Bake uncovered for 30 minutes or until cheese on top is melted and golden.