Preheat oven to 350 degrees and line two cookie sheets with parchment paper

Using a large bowl, whisk together the flour, cornstarch, baking soda, and salt

Using a large bowl, beat together the butter, brown sugar, and sugar
until light and fluffy

Beat in the egg until combined

Gradually beat in the flour ingredients until combined and a soft dough forms

Fold in the chocolate chunks, chocolate chips, and pumpkin spice

Using a medium ice cream scooper, scoop cookie dough onto the cookie sheets

Bake in the oven for 12 - 15 minutes or until lightly golden brown

Remove from the oven and allow to cool for a few minutes before enjoying!