01 -
Cook butter in a stainless steel pan over medium heat until the butter solids turn amber brown (about 10 minutes). Transfer all butter and browned bits to mixing bowl
02 -
Mix in espresso grounds and let the mixture cool to room temperature (approximately 20-30 minutes)
03 -
Whisk both sugars into the cooled butter mixture for one minute until well combined
04 -
Whisk in egg, egg yolk, and vanilla extract until smooth
05 -
Gently fold in flour, baking soda, salt, and chocolate until just combined
06 -
Scoop dough onto parchment-lined baking tray and freeze for at least 3-4 hours (preferably overnight)
07 -
Preheat oven to 350°F/180°C. Space frozen cookies 2 inches apart and bake for 10-12 minutes until edges are golden but center remains pale and puffy
08 -
Let cookies cool on the baking tray placed on a wire cooling rack