It’s 9:47pm, the house is finally quiet, and your sweet tooth won’t settle.
Enter the Belgian Chocolate Lava Cake in a Mug – a single-serve, microwave-friendly dessert with a molten centre and zero need to preheat anything.
We’re using Geldhof cocoa powder and Belgian couverture buttons, chocolate that melts smoothly and delivers deep cocoa flavour.
A great mug cake is a tiny science experiment with a delicious outcome. Microwaves cook by dielectric heating—they energise polar molecules (especially water), heating batter rapidly from the inside out rather than slowly from the edges like an oven.
That speed is why mug cakes are brilliant… and why they can go from fudgy to rubbery if you overshoot by even 15 seconds.
Here’s the good news: Belgian couverture is your cheat code for the lava effect. More cocoa butter means a smoother melt, glossier flow, and a more luxurious molten centre.
3 tbsp flour
2 tbsp Geldhof Cocoa Powder (one for a lighter chocolate flavour)
2 tbsp sugar
¼ tsp baking powder
Pinch of salt
3 tbsp milk
2 tbsp oil or melted unsalted butter
¼ tsp vanilla extract
4 Geldhof Couverture Buttons
1. In a mug, whisk together flour, sugar, Geldhof cocoa powder, baking powder, and salt.
2. Add milk, melted butter/oil, and vanilla. Whisk until smooth.
3. Press 4 Geldhof Milk couverture buttons into the centre.
4. Microwave on high for 60–70 s.
5. Rest 30 seconds, then dig in.
Serving ideas: vanilla ice cream, fresh berries, or a pinch of flaky salt.
The edges should be set while the centre still has a slight wobble. Resist the urge to overcook it – the cake will continue to firm up for a minute or two after coming out of the microwave, leaving the chocolate centre perfectly molten.
You can, but high-quality couverture chocolate creates a smoother, more fluid centre than standard compound chocolate.
Belgian couverture chocolate also delivers a deeper cocoa flavour and melts more evenly.
Yes. A square or two of your favourite chocolate placed in the centre works just as well.
Just be sure to press it into the batter rather than leaving it on top.
The most common reasons are overcooking the cake or not placing the chocolate deep enough into the batter.
The chocolate should be fully surrounded by batter so it melts while the cake cooks around it.
This recipe has been developed specifically for the microwave.
Baking it in the oven will require different timings and may not produce the same quick molten centre.
