Follow these simple steps to create your Chai-Spiced Double Chocolate Tahini Cookies:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Mix Wet Ingredients: In a large bowl, combine tahini, brown sugar, and granulated sugar. Whisk until smooth. Add eggs and vanilla extract, whisking until well combined.
3. Combine Dry Ingredients: In another bowl, sift together the flour, cocoa powder, baking soda, salt, and chai spice blend.
4. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Do not overmix.
5. Add Chocolate Chips: Fold in the semi-sweet chocolate chips and nuts if using, ensuring they are evenly distributed throughout the dough.
6. Scoop Dough: Using a cookie scoop or tablespoon, drop rounded portions of dough onto the prepared baking sheet, leaving space between each cookie.
7. Bake: Place the baking sheet in the preheated oven and bake for 12-15 minutes, or until the edges are set but the centers are still soft.
8. Cool: Remove cookies from the oven and let them cool on the baking sheet for 10 minutes before transferring to a wire rack to cool completely.

These simple steps will guide you in creating delicious cookies that are sure to impress anyone who tries them.