This chocolate lava mug cake is soft on the outside with a warm, molten center. Made with simple pantry ingredients and cooked in the microwave, it’s a quick single-serve dessert that’s ready in minutes.
In a microwave-safe mug (at least 12 oz), whisk together the sugar, flour, salt, baking powder, and cocoa powder until evenly combined.
Add the milk, vegetable oil, egg, and vanilla extract. Whisk until smooth and no dry pockets remain.
Press the dark chocolate squares into the center of the batter, pushing them slightly below the surface.
Microwave on high for 75–90 seconds, until the edges are set but the center is still soft.
Let the mug cake rest for 30–45 seconds before eating so the molten center can settle.
Notes
Watch the Microwave Timing: Start checking right at 75 seconds, because that small window is what keeps the center soft instead of fully set. I stop as soon as the edges look done.Choose the Right Mug: A wide 12–14 oz mug works best here, and I find it helps the batter cook evenly without spilling over the sides.Keep the Center Lava-Soft: The chocolate squares should be pressed just below the surface, and I like to pull the mug cake while the center still looks slightly glossy.