3. Using a handheld or standing mixer, beat the butter, applesauce, brown sugar, granulated sugar and salt on medium-high speed until light and fluffy, 2 to 3 minutes, scraping down the sides of the bowl halfway through. Beat in the egg and egg white, milk and vanilla.
4. In a medium bowl, whisk together the flour, baking soda and cinnamon, add to the batter, and beat just until the flour is absorbed. Gently fold in the oats with a rubber scraper.
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