Ingredients
Method
Melt butter in a saucepan over medium heat and cook until browned and fragrant, about 5–7 minutes. Let cool for 10 minutes.
In a bowl, mix browned butter with brown sugar and granulated sugar until smooth.
Add egg, egg yolk, and vanilla extract, mixing until fully combined.
In another bowl, whisk flour, baking soda, salt, and espresso grounds.
Gradually mix dry ingredients into wet ingredients until just combined.
Fold in chocolate chips.
Scoop dough onto a lined baking sheet and chill for 30 minutes (optional but recommended).
Bake at 350°F (175°C) for 10–12 minutes until edges are set and centers are soft.
Let cool on the baking sheet for 5 minutes before transferring.
Notes
Chilling improves flavor and texture but can be skipped if short on time. Store in an airtight container for up to 3 days. Do not overbake—cookies will continue cooking as they cool.
