Preheat oven to 350F. Line baking sheets with parchment paper.
Mix the melted butter, sugar, baking powder, espresso powder and salt.
Add the eggs and vanilla, beating until smooth.
Stir in the cocoa powder and flour; the dough will be sticky. Mix in the chocolate chips and chocolate chunks.
Drop the cookies by tablespoonfuls (about 1 1/2” balls) onto the baking sheets, leaving about 1 1/2” between them. Use a #40 scoop. Flatten the dough balls to about 3/8”.
Bake the cookies for 8-10 minutes, until they’re just set; they’ll be a bit shiny in the center. Remove from the oven and allow them to cool on the pan.
