Start by adding your butter and sugar into a stand mixer, and whip until light and fluffy.

Now you will add in your whole egg and the extra egg yolk, peppermint extract, and vanilla. Mix until creamy.

Then you will work at adding in your cocoa, flour, baking soda, and salt. Once mixed, place in the fridge wrapped in plastic wrap for 30 minutes.

Once dough is fully chilled you will use 2 tablespoons to measure the cookie dough and roll into balls. Then use a measuring spoon to press a cavity into each cookie.

Dust with granulated sugar. and bake in preheated 350 degree oven. Cook for 6-8 minutes or until your cookies are done.

Remove cookies and place on a cooling rack.

Once all your cookies are done, you can work on your chocolate ganache. In a microwave safe bowl, add your chocoalte, heavy cream, and vanilla. Heat at 20 second intervals until the chocolate is fuly melted. I stir between each heat cycle.

Once melted whip the chocolate ganache until the ganache is nice and fluffy.

Then to your cooled cookies you can pipe or spoon your ganache into each cookies.

Top with crushed peppermint or candy canes.