Closely adapted from Ana Sortun. Sortun likes these with cardamom, but for a variation I think they would be fabulous without the cardamom but adding chocolate chips.
Note this recipe requires at least 6 hours chilling time, which is not reflected in the prep and cook times.
Whisk together the flour, baking soda, salt and cardamom (if using) in a medium-large bowl.
Mix in the rolled oats, halveh and toasted sesame seeds. Set aside.
Using a stand mixer, beat the butter, sugars and tahini on medium speed until smooth and lightened in color, about 5 minutes.
Beat in the eggs one at a time, scraping the bottom and sides of the bowl in between each egg. Beat in the vanilla paste.
Mix in the oat mixture in 3 additions on the lowest speed. Add the chocolate chips with the last bit of oats if using.
When the mixture is evenly incorporated, cover with plastic and chill for at least 6 hours, until firm.
When you are ready to bake, preheat the oven to 350 F. Line 2 baking sheets with parchment paper or silicone mats.
Scoop out balls of cookie dough--I like a scant 1/4 cup for this recipe, 6 balls to a cookie sheet. Press the balls slightly and sprinkle with a flaky sea salt.
Bake until the cookies are only slightly browned at the edges and still look underdone in the middle, about 15 minutes.
Let the cookies cool on the cookie sheet before storing in airtight containers.