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Melt the butter and add the chopped onion and frizzle for a few minutes on low; do not brown onion.
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Add the stuffing mix to the butter mixture.
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In a 9x13 greased casserole, place the chicken breasts.
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Spread the sour cream over the chicken breasts.
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Put the stuffing mix on top of this.
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Cover with foil and bake in a 325 degree oven for 60-70 minutes, depending on your oven.
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NOTE: If your stuffing seems too dry, add a tad of water.