01 -
Set the oven to 175°C and line two baking trays with parchment paper.
02 -
Melt butter in a saucepan over medium heat, stirring frequently until it turns golden brown and develops a nutty aroma, about 5 to 7 minutes. Remove from heat and allow to cool slightly.
03 -
In a bowl, whisk together all-purpose flour, espresso powder, baking soda, and salt until evenly mixed.
04 -
In a separate bowl, blend the browned butter with dark brown sugar, granulated sugar, and vanilla extract until the mixture becomes creamy.
05 -
Gradually add the dry mixture to the wet ingredients, mixing just until combined. Fold in the toffee bits carefully.
06 -
Drop spoonfuls of dough spaced approximately 5 centimeters apart onto the prepared baking trays. Bake for 10 to 12 minutes until edges are golden and centers appear soft. Let cool completely before serving.