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1
Bring about 1 1/2 gallons of water to a full boil in a large saucepan. Add a generous amount of salt, and add the macaroni, stir.
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2
Cook for 9 minutes, stirring every couple of minutes, to ensure they don't stick together. Drain very well, toss the macaroni with the chicken, and set aside.
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3
Melt butter in another large saucepan, add the flour, and cook until very light brown, over medium heat.
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4
Slowly whisk in the milk and chicken broth, continue whisking for one minute. Reduce the heat, and simmer while whisking, until it thickens. It should be the consistency of smooth gravy. Turn off the heat, and whisk in the cheeses until smooth.
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5
Mix the cheese sauce with the macaroni/chicken mixture in the same pot that you boiled it in, or a very large mixing bowl.
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6
Spray two 13x9 inches baking dishes with cooking spray, and add the breadcrumbs to the pan, shaking them around to coat the entire pan. Discard the excess. DO NOT SKIP THIS STEP! It will ensure that your macaroni and cheese doesn't get stuck to the pan.
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7
Pour the mac & cheese into the baking pan, and smooth it out a little bit.
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8
Cover with aluminum foil, and bake @ 350 for 30-35 minutes, until bubbling.
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9
Remove from the oven, and cool for at least 5 minutes before serving.
