Preheat the oven to 175oC (fan).
Weigh everything out now.>Why does this matter? Ideally, you want to put this recipe together as quickly as possible after the butter has melted …. the warmer the butter, the better the gooey cookie middle turns out. Melt the butter in a pan on a very low heat. Do not let it boil!
Put both types of sugar into a mixing bowl. Add the melted butter and mix until its fully combined.>I use an wooden/regular spoon. No need for an electric whisk here. Takes 15 seconds of stirring. Add the 2 egg yolks and lightly mix that in too.>Takes 5 seconds. Add the flour and thoroughly mix together with a spoon again.
Mix in the raspberries and about 1/3 of the white chocolate (broken into chunks).
Place the cookie dough into the skillet/whatever you're using.
Ideally, place in the freezer for at least an hour (overnight is great too).>This stage isn't essential but it gives it the best results for a crunchy edge and gooey middle Bake for 19 mins from frozen. At this point, it should be browning around the edges but paler in the middle.>Only bake for 16 mins if you're not cooking from frozen>Please see my notes below for more tips on how to know when its done! Don't try to poke a skewer in to see if its clean, like you would with a cake! If you've achieved a gooey midde, the skewer wont be clean anyway! Break up another 1/3 of the white chocolate and scatter over the top of the cookie.
Leave to cool for at least 5 mins.>I know its hard to wait but do it!!! The cookie will still be cooking so if you start eating it as soon as its out the oven, it might be a little too gooey If you’d like, serve with a scoop of ice cream on top. Melt the remaining 1/3 of white chocolate and pour that over too!
Eat!