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in a small mixing bowl, cream butter and brown sugar.
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beat in egg and sour cream.
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combine the flour, baking soda and salt.
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gradually add to creamed mixture.
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mix well.
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drop by tablespoonfuls 2 inches apart onto greased baking sheets.
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bake at 375 degrees for 9-11 minutes or until golden beown.
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remove to wire racks to cool com[pletely.
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for frosting:.
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in a small saucepan, melt butter over low heat.
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add brown sugar.
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cook and stir for 2 minutes.
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gradually add the milk.
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bring to a boil, stirring constantly.
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remove from the heat.
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stir in confectioners' sugar.
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cool for 20-30 minutes.
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frost cooled cookies.