Chocolate lava mug cake is a winter-friendly dessert designed for moments when the craving hits hard and time is short. This single-serve recipe relies on accurate proportions and controlled microwave heat to create a soft outer crumb with a molten chocolate centre. Cocoa deepens flavour, butter adds richness, and dark chocolate melts slowly to form the signature lava. No oven, no resting batter, and no guesswork; just a warm, spoonable dessert that delivers comfort in every bite.