Whisk together flour, baking soda and salt in a medium-sized bowl. Set aside.
Add melted butter and brown sugar to a large bowl then beat with an electric mixer for 1 minute.
Add the vanilla, egg and egg yolk then beat until incorporated.
Reduce mixer speed to low then add dry ingredients to wet, mixing until almost combined and flour is still visible.
Turn the mixer off then use a wooden spoon to mix in 3/4 cup of chocolate chips and 1/3 cup of crushed candy canes until both are evenly distributed. Do not overmix.
Using a large, 2.5 Tablespoon-sized cookie scoop, scoop cookies onto parchment lined baking sheets, spacing cookie balls 2 inches apart.
Cover baking sheets with plastic wrap then chill in the refrigerator for a minimum of 4 hours or up to 2 days. (Mine chilled overnight.)
Preheat the oven to 350F.
Remove plastic wrap from baking sheets then bake for 11 to 12 minutes or until the cookie edges are set but the centers are still soft. Avoid overbaking.
Remove cookies from oven then press remaining chocolate chips and crushed candy cane into the tops of warm cookies.
Cool cookies on the baking sheet for 5 minutes before transferring to a wire rack.
Store cookies in an airtight container at room temperature up to 5 days.