Batter: In a large bowl or a food processor fitted with the steel blade, combine the SPLENDA® Granulated, oil, egg, and vanilla extract. Mix well or process for 1 minute, until well blended. Combine the flours, baking soda, baking powder, cinnamon and salt in a bowl. Add to the SPLENDA® mixture along with the yogurt and mix just until combined (or process with quick on/off pulses, just until combined). Stir in the apples with a rubber spatula.