Melt butter and milk in the microwave

Add and mix all the dry ingredients

Add chocolate, walnuts and vanilla extract.

Add the butter and milk mix while it is hot.

Fold well until all the ingredients are combined and the chocolate has melted.

Transfer the mixture into an 8 inch round microwave safe dish.

Combine all the sauce ingredients and whisk until there are no lumps.

Pour it into the pudding dish over the cake batter.

Microwave on MEDIUM (50%) for 11 minutes or until a skewer inserted into the edge comes out clean.

It's ready!