Pre-heat oven to 375 ºF (191 C).
In a standing mixer/with a hand mixer, mix the butter (at room temperature), brown sugar and white sugar together.
Once well mixed, add in vanilla and pumpkin puree and mix.
In a separate bowl, whisk together flour, salt, baking soda, corn starch and cinnamon.
Slowly add flour mixture to mixer and mix until well combined.
Once you have a cookie dough, mix in chocolate chips and chunks.
On a parchment paper lined baking sheet, form cookie dough balls. You should end up with 36. I used a 2 tbsp scooper.
Bake for 9 - 11 minutes.