Preheat oven to 350F. Grease an 8x8 baking pan with cooking spray.
In a small bowl, cover dates with hot water. Let stand for 10 minutes.
Drain dates, reserving 1 tbsp of the hot water. Add dates and water to a food processor and blend until a thick paste forms (see blog pics). You may need to stop blending and scrape down the sides a couple of times to get the paste to come together.
Add light butter, apple sauce, egg, and vanilla to the processor. Puree for 1-2 minutes, until the mixture is pale and creamy.
Add flour, cocoa powder, baking soda, and salt. Pulse until mixture is just combined, scraping down then sides once or twice if needed.
Add in chocolate chips. Pulse a couple of times to slightly break up the chips into the matter but still maintain some chunks.
Pour into prepare pan and spread batter evenly. Bake for 20-25 minutes. I like my brownies ultra fudgey, so I take them out after 20 minutes, when they are slightly under baked.
Let cool for at least 10 minutes. Cut into twelve brownies.