Preheat your oven to 180°C and line a 12 hole muffin tin with muffin cases.
To a large bowl add eggs, dairy free yoghurt, vegetable oil, soy milk and vanilla extract. Whisk well until everything is combined.
To a separate bowl add plain flour, caster sugar, cocoa powder, baking powder, bicarbonate of soda, xanthan gum and salt. Mix well until combined.
Add the dry ingredients to the wet ingredients and mix well until everything is combined. Add the chocolate chips and mix again.
Divide the mixture between the 12 muffin cases and top with extra dairy free chocolate chunks.
Bake in the oven for around 22-25 minutes, until a skewer comes out clean.