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Ingredients

Grab these ingredients before you get started:

3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature

1 cup (200g) packed light or dark brown sugar

1 large egg + 1 egg yolk, at room temperature

2 teaspoons pure vanilla extract

2 cups (250g) all-purpose flour (spooned & leveled)

2 teaspoons cornstarch (aka cornflour)

1 teaspoon baking soda

1/2 teaspoon salt

1 and 1/2 cups (270g) semi-sweet chocolate chips

optional: chocolate buttercream for topping (recipe on my website)