1.Preheat the oven to 375F and grease a 3 quart casserole dish.
2.In a large saucepan, melt 6 tbsp of the butter then whisk in the flour. Continue to whisk the mixture until golden brown (about 3 minutes).
3.Slowly add the milk to the mixture, continuing to whisk to break up clumps. Continue to whisk the mixture until it thickens (about 10 minutes).
4.Add the seasonings, 4 cups of the cheddar cheese and 2 cups of the jack cheese to the mixture, continuing to stir until all of the cheese is melted.
5.In a medium bowl, combine the chicken, buffalo sauce and onions and toss until well mixed.
6.To build the casserole, place a layer of noodles over the bottom of the dish, then layer with the cheese sauce, shredded cheddar cheese and buffalo chicken, repeating until all of the food is layered.
7.Melt 2 tbsp butter and toss with the bread cubes, then spread across the top of the casserole.
8.Bake at 375F until top is golden brown and cheese is bubbling (about 30 minutes).
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