In a large bowl beat the butter and powdered sugar till it becomes light and fluffy.
1/2 Cup Unsalted Butter, 1/2 Cup Powdered Sugar
Add tahini and vanilla extract to this mixture and beat for a couple minutes.
1/3 Cup Roasted Tahini, 1 Teaspoon Vanilla Extract
Separately combine all purpose flour, baking soda and salt.
1.5 Cups All Purpose Flour, 1/2 Teaspoon Baking Soda, 1/2 Teaspoon Salt
Add the dry ingredients to the wet slowly and blend everything together to make a crumbly dough.
Make 2 cylindrical logs from the dough around 2-3 inches in thickness.
Wrap the dough in a plastic wrap and refrigerate for around an hour.
Roll the log in black sesame seeds, gently pressing to coat it.
2 Tablespoon Black Sesame Seeds
Cut the log into round cookies around 1/2 inch in thickness.
Place the cookies on a prepared tray lined with parchment paper and bake them in a preheated oven at 180 C or 350 F for 15-20 minutes.
Sesame Cookies are ready. Cool them completely on a wire rack before serving.