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Preheat oven to 350 degrees and lightly grease a 13 x 9-inch baking dish.
Melt butter in a skillet over medium heat. Add onion and cook until beginning to soften, about 3 to 4 minutes. Remove from heat.
In a large bowl, mix together all ingredients (including onions), except Corn Flakes and melted butter.
Transfer mixture to prepared baking dish.
In a small bowl, mix together crushed Corn Flakes and melted butter. Sprinkle on top of casserole.
Bake for 45 to 55 minutes.