Preheat the oven to 350 and prepare a baking sheet by lining with a Silpat liner or with parchment paper. Set aside.
In a large bowl, use a handheld mixer to blend together the butter, brown sugar, white sugar, eggs and molasses. Beat until smooth.
Add the following ingredients in this order: flour, oats, cinnamon, baking soda, salt and cornstarch. Use the mixer, set to low speed, mix together the dry ingredients slightly before beginning to blend the dry into the wet ingredients. Just mix until combined; don't over mix.
Stir in 2 cups of the cinnamon chips with a wooden spoon or spatula.
Using a cookie scoop, portion the dough into heaping tablespoons.
Gently flatten the ball of cookie batter to about 1/2 inch thick. Sprinkle a few of the leftover cinnamon chips onto the top of each cookie.
Bake for 15 minutes.
Remove from oven and allow to cool on the baking sheet for 2-3 minutes before transferring to a cooling rack to finish cooling.