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In a small bowl whisk together flour, baking soda, and salt.
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Preheat oven to 177°C. Line two baking sheets with parchment paper.
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In the bowl of a stand mixer, beat butter on medium until creamy, for about 2 minutes. Add both granulated and brown sugars and continue to mix for 3 minutes.
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Add egg, vanilla, and Lee Kum Kee Pure Sesame Oil, and mix until combined.
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Add flour mixture on low speed until combined. Add in chopped chocolate and mix well to combine.
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Portion dough into 70g balls. Place 4 cookies on a sheet pan. Freeze ten minutes. Remove from freezer and bake only one cookie sheet at a time for 11-14 minutes. The edges of the cookies should be set and brown and the middle of the cookies should be light golden in color.