In a large bowl, combine the hash browns, cheese,
sour cream, soup, 1/2 cup butter and onion.
Spread into a greased 13x9-in. baking dish.
Sprinkle with paprika. Combine cornflakes and
remaining butter; sprinkle on top. Bake, covered,
at 350° for 40-50 minutes or until heated
through. Uncover, bake 10 minutes longer or until
top is golden brown. If desired, garnish with
Freeze option- Cover and freeze unbaked
casserole. To use, partially thaw in refrigerator
overnight. Remove from refrigerator 30 minutes
before baking. Preheat oven to 350°. Bake
casserole as directed, increasing time as
necessary to heat through and for a thermometer
inserted in center to read 165°.