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Melt 1/2 cup butter in a Dutch oven over medium-high heat; add
diced onion, and sauté 5 minutes or until tender.
Whisk in flour until smooth, and cook, whisking constantly, 1
minute. Gradually add milk and wine; cook, whisking constantly, 5
to 6 minutes or until thickened.
Add bouillon granules, seasoned pepper, and 1 cup cheese. Cook,
whisking constantly, 1 minute or until bouillon granules dissolve
and cheese melts. Remove from heat. Stir in chicken, pasta, and
mushrooms. Spoon into a lightly greased 13- x 9-inch baking
dish.
Bake chicken mixture, covered, at 350 for 20 minutes.
Stir together remaining 1/2 cup cheese, breadcrumbs, and 2
tablespoons melted butter, and sprinkle evenly over casserole.
Bake casserole 10 to 15 more minutes.
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