Preheat oven to 350 degrees Fahrenheit. Grease a 9x9 square baking pan with cooking spray, then line with parchment paper so that it hangs over two sides.
In a medium bowl combine tahini, maple syrup, flax eggs, and vanilla extract with an electric mixer on medium speed. Add coconut sugar, cocoa powder, baking soda and salt and mix until combined.
Pour batter into prepared baking pan and spread into an even layer. Batter will be sticky, use parchment or your hands to help spread. Sprinkle chocolate chips over top. Bake for 30 to 35 minutes until a toothpick comes out clean.
Remove from oven, place pan on wire to cool. Sprinkle with sea salt. When cool, slice into bars.