Bring a large pot of water to a boil and add the noodles. Cook for about 9 minutes until el dente. Drain the noodles and set aside.
In the same pot, melt the butter. Once the butter is melted, stir in the flour to form a paste then stir in the milk and seasonings.
Bring to a simmer on medium heat, then add the cheddar and Monterey jack cheese a cup at a time, stirring between each addition, until the cheese is melted. Continue to simmer on medium heat until all the cheese is melted and mixture is smooth.
Stir in the hot sauce and ΒΌ cup of crumbled blue cheese, then add the noodles and chicken. Stir well so that everything is coated well with the sauce.
Continue heating on medium heat until heated through and sauce is slightly thickened.
Remove from heat, add a handful of green onion and additional blue cheese, if desired and serve.