In a medium bowl, sift together flour, cocoa,
espresso, baking powder, and salt. With an
electric mixer, cream butter and brown sugar until
light and fluffy. Beat in egg until well combined;
mix in cooled chocolate. With mixer on low,
gradually add flour mixture; beat in milk until
just combined. Flatten dough into a disk; wrap in
plastic. Freeze until firm, about 45 minute
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