Rocky Road Cookies

Preheat the oven to 200'c/180'c fan oven/ gas mark 6.

In a small saucepan, melt together the butter and the dark chocolate chips.

Remove from the heat and set aside to cool once it's all melted together. 

In a separate bowl, mic together the melted chocolate mixture with the light muscovado sugar, egg and vanilla extract. 

Sift together the flour, baking powder and salt in a separate bowl and then add this to the chocolate mixture mixing together until fully incorporated. 

Sift in the white chocolate chips and the walnuts.

Using a spoon, drop walnut (in shell) sized pieces on to a baking tray which is lined with parchment paper (Make sure you leave enough room between each ball as these will spread apart when baking). 

Bake 8-10 minutes (8 if you prefer them slightly chewy, 10 if you're more into a crunch). Bring them out of the oven and while they're still soft, add a few marshmallows to the top of each. Transfer these to a wire cooling rack.