Preheat the oven to 350 degrees Fahrenheit. Line a dark baking sheet with parchment paper and set aside.
In a nonstick skillet, add 1 cup sesame seeds over medium heat. Toast the sesame seeds, stirring frequently, until they are brown and emit a nutty aroma.
In the bowl of a stand mixer, add ½ cup unsalted butter and 1 cup brown sugar. Use the paddle attachment to mix until fully combined. The combination will be very light in color.
Add 1 large egg and 1 teaspoon vanilla extract and mix again.
In a small bowl, combine 1 cup all-purpose flour, ¼ teaspoon salt and ½ teaspoon baking soda and mix until the ingredients are evenly distributed. Then add the dry mixture into the wet mixture in the stand mixer.
Finally, add the toasted sesame seeds and mix again until evenly distributed.
Drop cookie dough onto the prepared baking sheet in balls of 1 tsp. Place the baking sheet in the oven and bake for 6-8 minutes, until the cookies are brown on the edges and bottom but not burnt (the longer you bake them for, the crispier they will be).
Once cooked, remove them from the oven and slide the parchment paper off the baking sheet. Allow the cookies to cool and harden. They should snap when broken. Serve and enjoy!