To a microwave-safe mug, cup, or ramekin, mix together the dry ingredients.
2 1/2 tablespoons (17 grams) Dutch-process cocoa powder, 1 1/2 tablespoons (12 grams) flour, pinch of salt, 2 tablespoons (25 grams) granulated sugar
Stir in the wet ingredients.
2 tablespoons oil, 2 tablespoons water, 1/2 teaspoon vanilla extract
Add 1 tablespoon of chopped chocolate and stir until combined.
1 tablespoon + 1/2 tablespoon vegan semi-sweet chocolate chips
Top with the remaining 1/2 tablespoon of chocolate, if desired. Using a silicone spatula to push the batter on the sides of the cup down to the rest of the batter.
My microwave is 800 watts and I needed 50 seconds. It should be gooey inside but the top shouldn't be wet but it might look glossy. The exact time you need will depend on your microwave and the size, shape and material your mug is made out of. To be safe, I recommend to start checking at 40 seconds.
Serve! But don't burn your tongue.