Soft-Baked Triple Chocolate Chip Cookies

INGREDIENTS

3/4 cup

or 170g) unsalted butter, softened to room temperature

3/4 cup

packed dark brown sugar

1/4 cup

granulated sugar

large egg, at room temperature

2 tsp

vanilla extract

2 cups

all-purpose flour (measured correctly)

2 tsp

cornstarch (aka cornflour)

1 tsp

baking soda

1/2 tsp

salt

1/2 cup

semi-sweet chocolate chips

1/2 cup

white chocolate chips

1/2 cup

Sno-Caps (or any kind of chocolate chip)