Preheat oven to 350�F. Spray 9 x 23 cm baking pan with oil and wipe off excess, or use nonstick pan. Sift together flour and cocoa powder. Set aside. Melt chocolate in double boiler. When melted, turn off heat and add oil. Mix until combined. Cool slightly. Beat egg whites on high with sugar until very fluffy. Add applesauce, yogurt, vanilla extract, melted chocolate, and dry ingredients. Lower speed and continue beating until well incorporated. Pour mixture into baking pan and bake for 20-25 minutes. The center of the mixture will feel firm and not liquidy when touched lightly. A toothpick inserted will come out covered with batter, not clean. Cool and serve chilled. Cut into bars. 21% calories from fat