01 -
In a large mixing bowl, combine the melted butter, white sugar, and brown sugar. Mix until fully combined and smooth.
02 -
Add the vanilla essence, egg, and egg yolk to the sugar mixture. Beat until the ingredients are well combined.
03 -
In a separate bowl, whisk together the all-purpose flour, baking soda, and kosher salt.
04 -
Gradually incorporate the dry ingredients into the wet mixture, stirring until a dough forms.
05 -
Gently fold in the Cadbury mini eggs, reserving extra for topping.
06 -
Preheat the oven to 175°C (350°F). Line a baking pan with parchment paper and lightly grease it.
07 -
Press the cookie dough evenly into the prepared pan. Decorate the top with additional Cadbury mini eggs, pressing them gently into the dough.
08 -
Bake the cookie bars in the preheated oven for 23-25 minutes, or until the edges are lightly golden. Avoid overbaking to keep them chewy.
09 -
Allow the cookie bars to cool in the pan before cutting them into squares. Garnish with flaky sea salt, if desired, and serve.