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Grease 4 regular sized mugs or 4 small ramekins and preheat your oven to 350F / 180C .
Put the flour, sugar, cocoa, baking powder and a pinch of salt in a large mixing bowl and mix until combined.
Whisk together the eggs, melted butter, coffee, vanilla and milk, then pour into the dry ingredients and mix until smooth. Stir in the chocolate chunks.
Divide the batter into 4 containers, filling about ⅔ of the way.
To make the sauce: In a small bowl mix together the boiling water, sugar and cocoa powder until the sugar is dissolved.
Pour the sauce over the chocolate batter. Divide it between the 4 mugs.
Bake on the middle shelf of the oven for 20-25 minutes until the surface looks risen and crisp. Dust with icing sugar, and top with ice cream if you like and serve straight away – as you scoop to the bottom of your mug you should find a gorgeous chocolate sauce underneath!