Preheat oven to 350 degrees. Spray a 11 x 17 jelly roll pan with nonstick spray.

Combine butter, 2 oz. chocolate, and water in a small saucepan. Heat until chocolate is melted.

In a separate small bowl, combine flour and baking soda. Set aside.

In a large mixing bowl, combine sugar, buttermilk, eggs, and vanilla. With mixer on low, pour in chocolate mixture slowly. With mixer still on, add flour mixture a little bit at a time until totally incorporated. Pour into prepared pan and bake 20-25 minutes or until a pick comes out clean.

After cake comes out of oven, prepare frosting.

Combine cream, white chocolate, and butter in a medium saucepan. Heat until everything is melted and smooth. Remove from heat and whisk in powdered sugar, vanilla, and peppermint and beat until smooth. Frosting should easily drizzle from whisk when whisk is lifted up. If needed, add additional cream.

While still warm, pour icing over cake and gently spread with spoon to smooth.

For ganache, heat cream, chocolate chips and peppermint extract and whisk until smooth. Ganache will be extra runny when hot. Let it cool a bit to come to a thicker consistency and then drizzle over cake. Top with crushed candy canes.