Preheat oven to 350 degrees. Coat a 9” non-stick baking pan with cooking spray.
In an electric mixer or using a hand mixer in a large bowl, combine the egg whites, egg, applesauce, canola oil, and vanilla.
Add both sugars and blend well. Stir in the flour, cocoa, baking powder, and salt, and ¼ cup chocolate chips and mix just until smooth. Do not over-mix.
Pour the batter into the prepared pan and spread evenly. Sprinkle the remaining ¼ cup of chips evenly over the top of the brownies.
Bake for 20-25 minutes or until just set. A toothpick inserted into the outside edge should come out almost clean, but the middle should still be somewhat soft. The key to this brownie is in the bake time. It should be slightly under-baked in the middle to give it the fudgy consistency. The inside must remain soft. Over baking will change the brownie by causing it to be dry and cakelike. I usually remove them from the oven at 22-23 minutes. I let them set a bit. If too gooey, I place them back in the oven for 2-3 more minutes.
Remove from the oven and let cool on the countertop.
Cut into 16 squares. Store in an airtight container for a few days. They freeze great, too!