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Heat oven to 350 F
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Beat butter and sugar, on medium speed until creamy
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Add egg and vanilla, beat well
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Stir together flour, cocoa, baking soda and salt
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Gradually add dry mixture to butter mixture, beating well
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Stir in mint chocolate chips
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Drop by rounded teaspoons onto ungreased baking sheet
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Bake 8-9 minutes or just until set - do not overtake
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Cool slightly on pan
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Remove to wire rack and cool completely