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In mixing bowl, cream butter and sugar. 
 
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Add egg, milk and vanilla; mix well. 
 
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Combine flour, cocoa, baking soda and salt; beat into creamed mixture.
 
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Drop by rounded teaspoonfuls onto ungreased cookie sheets. 
 
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Bake at 350 for 8 minutes. 
 
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Meanwhile cut mashmallows in half. 
 
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Press a marshmallow half, cut side down, onto each cookie. 
 
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Return to oven for 2 minutes. 
 
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Cool completely on wire rack.
 
 
 
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