Капкейк с Нутеллой вместе с Джеммой

I was never allowed Nutella on my toast when I was a kid, except when we went to France on holiday. It was like a dream come true! Nutella is awesome and you guys must know that as so many of you have asked for me to do a Nutella recipe. So here you go! For the cupcakes - 50g roasted, skinned & pulverised Hazelnuts 100g self raising flour 25g cocoa powder 125g caster sugar 1/4 tsp bicarbonate of soda pinch of salt 140g unsalted butter, soft 2 large free-range eggs 1.5 tbs whole milk 1/4 tsp vanilla extrac