Heat oven to 350°. In a bowl, whisk together
flour, cocoa, baking powder, baking soda
and salt. In another bowl, beat butter,
granulated sugar and brown sugar for
2 minutes, until fluffy. Beat in egg and vanilla
extract until just combined. Pour in flour
mixture and beat on low until just combined.
Carefully fold in chocolate chips and
Drop tablespoonfuls of batter on baking
sheets, spacing them about 2 inches apart.
Press down lightly to flatten. Gently press a
whole pretzel on top of each cookie.
Bake at 350° for 11 minutes. Transfer to a
wire rack to cool completely.