• Preheat the oven to 350°F (180°C). Line an 8-inch x 8-inch square pan with parchment paper. Slightly oil paper with oil spray, set aside.
• In a mixing bowl, whisk flour, sugar, salt, and baking soda.
• Make 3 wells in the center of the flour. In the first one, add oil. In the second one, add apple cider vinegar, and in the third one, add the vanilla extract.
• Pour the water over the bowl and using a whisk, whisk until smooth and no more flour lumps can be seen.
• Transfer the wacky cake batter to the prepared pan and bake it for 30-35 minutes or until golden brown on the top and a pick inserted in the center of the cake comes out clean.
• Cool down on a wire rack for an hour or until cool before frosting.
• Frost with vegan vanilla frosting and add sprinkles to decorate or serve plain with a dust of powdered sugar.

Storage

• Store up to 4 days in the fridge in a sealed container or freeze for later and thaw in the fridge the day before.