Chocolate, Raisin and Hazelnut Biscuits

Name: Chocolate, Raisin and Hazelnut Biscuits
Prep time: 10 min
Cook time: 35 min
Total time: 35 min
Yield: 16 pieces
Ingredients: 100 g blanched hazelnuts; 130 g unsalted butter; 120 g light brown sugar; 50 g dark brown muscovado sugar; 140 g plain flour; 20 g cocoa powder; 1 large egg; ½ tsp baking powder; 1 pinch fine sea salt; 100 g raisins; 70 g rolled oats; 100 g dark chocolate chips