Position rack in centre of oven, then preheat to 350°F. Spray a 9x13-in baking pan with cooking spray.
Combine oil and chocolate in a large saucepan and set over medium-low. Heat, stirring frequently, until chocolate is melted. Remove from heat.
Add sugar and applesauce. Stir until sugar is dissolved. Stir in egg whites and vanilla until combined.
Whisk together oats, flour, baking powder and salt in a large bowl.
Stir oat mixture into chocolate mixture, just until combined. Spread evenly into prepared pan.
Bake until a toothpick inserted in centre comes out clean, 22 to 25 minutes. Let cool on a rack. Cut into bars. Sprinkle with powdered sugar just before serving. Store in an airtight container.
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Last updated: February 9th, 2021
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