Combine the first 5 ingredients in a quart mason jar and fill with water to the jar neck. Cover and refrigerate overnight. The next morning, empty the soaked grains/water into a blender. Blend on high speed for 2-5 minutes (depending on the blender’s power) until the mixture thickens and no full grains remain. Add brown sugar, oil, eggs and salt and blend until thoroughly combined. Add baking powder and soda and blend until just combined.