In a large bowl, whisk the butter and brown sugar together until well combined.
12 tablespoons unsalted butter, 1 cup brown sugar
Add the egg and vanilla and whisk to combine.
1 large egg, 1 teaspoon pure vanilla extract
Add the flour and baking soda and mix just until combined.
1¾ cups all-purpose flour, 1 teaspoon baking soda
Lastly, add the dark chocolate, white chocolate, and candy canes. Fold them gently into the batter.
¾ cup dark chocolate chips, ¾ cup white chocolate chips, ½ cup crushed candy canes
Cover and transfer the cookie dough to the fridge to chill for 30 minutes. While the dough chills, preheat oven to 375°F.
Once the dough is completely chilled, scoop out 2-tablespoon-sized balls onto a parchment-lined baking sheet. Make sure to place them at least 2 inches apart-- these cookies will spread.
Bake the cookies for 12-14 minutes, or until the edges are just set. Immediately when the cookies come out of the oven, tap the tray on the counter to deflate the cookies slightly.
Allow the cookies to cool on the tray and then transfer them to an airtight container.