Preheat the oven to 350 degrees F. Lightly oil a 6" cast iron skillet or baking dish
In a small bowl mix together flour, white sugar, 1 tablespoon cocoa powder, baking powder, and salt. In another bowl, whisk together vanilla extract, oil, and almond milk. Transfer to flour/sugar mixture and stir to combine. Pour batter into prepared baking dish.
Combine brown sugar and the remaining 2 tablespoons of cocoa powder and sprinkle over the batter. Pour hot water over the top; do not stir in!
Place cake in the oven and bake for 30 minutes until a thick crust has formed and the fudge sauce is bubbling underneath.
Let cool for 15 minutes. Top with powdered sugar, berries, or your favorite non-dairy ice cream.