In a large heavy bottomed pot over medium high heat, add the sugar and stir constantly until it is melted and a deep amber, caramel color. Should take about 6 to 10 minutes. Don't walk away.
Carefully add the milk or cream while stirring, it will bubble up a lot, keep stirring for another minute or two. Remove from heat, add butter, salt and vanilla extract and stir until smooth. Pour into heat proof jar and allow to sit at room temp to cool. Can be made up to 2 weeks ahead of time stored in the fridge.
For the Cookie Dough:
In a large mixing bowl, combine all the dry ingredients and set aside.
In the bowl of a stand-mixer fitted with the paddle attachment, add the butter and sugars and beat until smooth, lighter and fluffy. Around 5 minutes.
Add the egg and then the yolk, mixing after each addition. Add the smooth tahini, you may need to pop in the microwave for 30 seconds to loosen, mix to incorporate. Next add the vanilla extract and mix to combine.
Slowly add half of the dry mixture and combine, then add the rest and combine until all the flour bits are incorporated. Don't over mix. Add the chocolate chunks while the mixer is running on low, to stir in and not break them up too much.
Remove bowl from stand and stir in the salted caramel by hand using a wooden spoon or spatula. You want to incorporate into the dough, but not completely, you still want to see some swirls of caramel. Cover and chill for at least an hour and half, up to 3 days.
Bake the Cookies:
Pre-heat the oven to 350 degrees and line two baking sheets with parchment paper and set aside.
Remove the dough from the fridge, if it's too hard to scoop out, let it sit at room temp for about 20 minutes. I used about a tablespoon size ice cream scoop for mine and scoop out the dough and place on the prepared baking sheets, not too close together. Sprinkle with a little sea salt. Pop in the freezer for about 10 minutes. Place in the oven, if baking both sheets at once, halfway through, rotate from top to bottom and front to back. Start checking cookies at 12 minutes, mine took 15. Cookies are done when golden brown. Allow cookies to cool on baking sheet on cooling rack. Store cookies in airtight container for up to a week at room temp. You can also freeze the dough balls if not baking the entire batch. Just scoop, roll into balls and place in a airtight freezer bag. Good in the freezer for up to 3 months. When ready to bake from frozen, no need to thaw, just pop right into oven from freezer. May take a minute or two longer.
Enjoy!
Recipe by Social Buttercream at https://socialbuttercream.com/2020/05/30/tahini-salted-caramel-chocolate-chunk-cookies-cookie-kismet/