In a large bowl, combine all of the wet ingredients; tahini, egg, vanilla, and whisk well to combine.
Add in dry ingredients; cocoa powder, sugar, sea salt and baking soda, and use a spatula to combine.
Once the mixture has been combined, add in dark chocolate chips and mix to incorporate.
Line a baking sheet with parchment paper, and scoop dough into balls (approximately 1.5 tablespoons), until 12 balls are formed.
Using your finger or the back of a spoon, gently press the balls into cookies, just a little. Don’t worry about making them too flat, they will flatten out more when they bake.
Transfer baking sheet to the oven for 15 minutes until cookies are baked but still tender. They will harden when they cool.
Remove from the oven and sprinkle each cookie with a pinch of flaky sea salt.