Start by browning 120g of the butter. To do this, chop the butter into evenly sized pieces then place into a medium saucepan. Place over a medium heat & allow to melt, stirring regularly with a spatula. Keep cooking, until the butter starts to foam, smell nutty & you can see that the milk solids in the bottom of the pan have turned golden brown.
Transfer the brown butter to a bowl then leave to cool to room temperature. In the meantime, chop the remaining 80g of butter into small pieces & leave to soften at room temperature.The brown butter should take around 30 minutes to cool. Next, place both butters into the bowl of a stand mixer along with the light brown sugar & the caster sugar.
Using the paddle attachment, mix the butter & sugar on a medium speed until fully combined but no more than 2 minutes. It's important not to incorporate too much air at this stage!
With the mixer still running, add in the egg & yolks then mix to combine.
Next, sift in the flour, salt, baking powder & bicarbonate of soda then mix on a low speed until just combined.
Roughly chop 70g of the white chocolate & cut the fudge into 1cm pieces. Add both into the cookie dough along with the cranberries & stir through.
Place the bowl of cookie dough into a fridge & leave for 30 minutes, to firm up slightly.
In the meantime, chop the remaining 80g of white chocolate into 13 chunks.
Using a cookie scoop (or a spoon), portion the cookie dough into 13 equally sized portions. Each should weigh around 90 grams.
With your hands, roll a portion of cookie dough into a ball then press a white chocolate chunk into the top. Repeat with the remaining dough.
Place the balls of cookie dough into an airtight container & refrigerate overnight.