Preheat the oven to 350°F and line a baking sheet with parchment paper. You don’t want a sticky mess.
Mix the flour, cocoa powder, espresso powder, baking soda, and salt in a bowl. No lumps allowed.
Beat the melted butter, brown sugar, and granulated sugar in a separate bowl until smooth. No lazy stirring.
Add the egg and vanilla extract, mixing until fully combined. No half-hearted whisking.
Gradually mix the dry ingredients into the wet ingredients. Stir just until combined—overmixing is the enemy.
Fold in the chocolate chips. Try not to eat all of them before they hit the dough.
Scoop tablespoon-sized portions onto the baking sheet, spacing them 2 inches apart.
Bake for 10 minutes. They’ll look soft, but trust the process.
Cool on the sheet for 5 minutes, then transfer to a rack. If you make it that far.
Devour immediately, or store in an airtight container. (But let’s be real, they won’t last.)