Preheat oven to 375 degrees. Combine the sugars and applesauce with an electric or hand-held mixer. Beat in Ener-G mixture, non-dairy milk, vanilla and vinegar. Combine the dry ingredients (except the chocolate chips) in a separate bowl. Gradually add the dry mixture to the wet ingredients, then stir in the chocolate chips. Pour the batter into a parchment-lined (or non-stick silicone) 9-inch x 13-inch baking dish. Bake for 16 to 20 minutes, until a toothpick inserted into the center comes out clean. For best flavor, make a day ahead.