Preheat the oven to 350°F (180°C) and line a cookie sheet with a piece of parchment paper or silicone mat.
In a bowl, cream together the butter and sugars until light in color and fluffy in texture.
Add in the eggs, corn syrup and vanilla extract. Mix until combined.
Next, add the flour, cocoa, corn starch, baking soda and salt. Mix until a soft dough forms.
Open and cut each peppermint bark square into 4 equal pieces.
Divide the dough into 3 tbsp portions, flatten each portion, stack 4 pieces of peppermint bark on top of each other and then roll into a ball before arranging on a parchment or silicone lined cookie sheet.
Bake for 9-11 minutes or until the cookies spread slightly and start to crack.
Once cooled, melt the white chocolate chips in the microwave and dip the edge of the cookie into the white chocolate and sprinkle with crushed peppermint candies. Enjoy!