Preheat the oven to 350F, then line a baking sheet with parchment paper or silpat.
In a medium bowl, cream the butter and both sugars together. Add in the vanilla and egg and mix until everything is smooth and well incorporated.
½ cup butter, ½ cup brown sugar, ¼ cup granulated sugar, 1 egg, 1 teaspoon vanilla extract
Add in the dry ingredients over the wet ingredient mixture, starting with the flour, corn starch, baking soda, and salt. Stir just until combined.
1& ½ cup flour, 2 tablespoon corn starch, ½ teaspoon baking soda, ½ teaspoon salt
Fold in the chocolate chips and crushed candy cane pieces, then using a large cookie scoop, scoop out the cookie dough into 10 4-tablespoon cookie dough balls and place on the prepared baking sheet.
¾ cup semi sweet chocolate chips, 5 candy canes
Place them on the prepared baking sheet and bake for 10 minutes. Don't worry if they look underdone or gooey in the middle. That's what we want, they will continue to bake even after you pull them out of the oven to cool.
Top the cookies with extra chocolate chips and crushed candy cane pieces as soon as they come out of the oven, cool on the cookie sheet for 5 minutes then transfer to a cooling rack.