Stir together first 8 ingredients in a large bowl. Spoon into an 13- x 9-inch baking dish coated with cooking spray.
Bake at 350° for 30 minutes; sprinkle onion rings evenly over top. Bake 5 to 10 more minutes or until bubbly around edges. Let stand 5 to 10 minutes before serving.
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Winterville, NC 28590