Adding instant espresso or instant coffee helps richen the flavor of the chocolate, and with double chocolate, everyone will like them twice as much.

Double Chocolate Espresso Crinkles

Stir together sugar, cocoa, and espresso powder in a medium bowl. Stir in oil until smooth. Stir in eggs, one at a time, and vanilla. 

Whisk together flour, baking powder, and salt; stir into cocoa mixture until combined. Stir in chocolate chips. Cover and chill at least 4 hours.

Preheat oven to 350 degrees. Line cookie sheets with parchment paper. Roll dough into 1½-inch balls. Roll in powdered sugar to coat. Place 2 inches apart on prepared cookie sheets. 

Bake for 10 to 12 minutes or until edges are firm and cookies no longer appear wet. Cool 1 minute on cookie sheets. Transfer cookies to wire racks to cool completely. 