Pre-heat oven to 350 degrees F. Butter a 9 inch cast iron skillet, and set aside.

In the bowl of a stand mixer fitted with a paddle attachment, cream together the butter and sugar until lightened in color, about 3 minutes.

Add in eggs, one at a time, beating well after each addition. Pour in vanilla extract.

In a separate small bowl combine together the dry ingredients.

Add the dry ingredients to the wet ingredients in three batches, mixing after each one. Fold in crushed candy canes and milk chocolate chips.

Spread the batter in the skillet, and bake for 25 minutes, or until golden brown with a gooey center.