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Preheat the oven to 350ºF degrees. Line 2 baking sheets with parchment paper and set aside.
Combine the flour, baking soda, cornstarch, and salt; stir with a whisk. Set aside.
Combine melted butter and sugars in a large mixing bowl. Stir with a whisk until the mixture is smooth and free of clumps. Whisk in the egg, egg yolk, and vanilla.
Add the flour mixture and stir just until well blended. Fold in the chocolate toffee pieces and butterscotch chips.
Roll cookie dough into 1.5 tablespoons sized balls and place them 2 inches apart on the prepared baking sheets.
Bake cookies for 12 minutes or until lightly brown and just underdone. Cool the cookies on the pan for 10 minutes. Remove from the pan and cool completely on a wire rack.