Preheat oven to 350°F. Grease a 8″ round cake pan that is at least 2″ deep, line with parchment, grease again and dust with flour.
Combine soy milk and apple cider vinegar in a measuring jar. Set aside for 5~10 minutes to curdle.
In a mixing bowl, sift cake flour, baking powder, baking soda and salt.
To the soy milk mixture, add the melted and cooled butter, condensed milk and vanilla. Mix well to combine.
Slowly pour in the wet ingredients into the dry ingredients and mix until well combined.
Stir in the chocolate chips or the crushed oreos into the batter, if desired.
Pour the batter into the prepared baking pan and bake for 22~25 minutes or until a cake tester inserted into the middle of the cake comes out clean.
Let the cake cool in the pan for 5 minutes before turning it over onto a wire rack to cool completely. Once completely cooled, then frost of ice the cake as desired.