1 1/2 cups Oreo crumbs
2 tbs sugar
1/4 cup butter, melted
2 cups semi-sweet chocolate chips
6 egg yolks
1 3/4 cups heavy whipping cream
1 tsp vanilla extract
Chocolate Buttercream Frosting
1/2 cup butter, softened
3 cups powdered sugar
3 tbs cocoa powder
3 to 4 tbs milk
In a small bowl, combine Oreos and sugar; stir in butter. Press onto the bottom and 1 1/2" up the sides of a greased 9" springform pan. Place on a baking sheet. Bake at 350 degrees for 10 minutes. Cool on a wire rack.
In a large microwave safe bowl, melt chocolate chips; stir until smooth. Cool. In a small bowl, combine the egg yolks, cream, and vanilla. Gradually stir a third of the cream mixture into melted chocolate until blended. Fold in remaining cream mixture just until blended. Pour into crust
Place pan on a baking sheet. Bake at 350 degrees for 45 - 50 minutes, or until center is almost set. Cool on a wire rack for 10 minutes. Carefully run a knife around edge of pan to loosen; cool 1 hour longer. Refrigerate overnight.
In a small bowl, combine the butter, powdered sugar, cocoa, and enough milk to achieve a piping consistency. Using a large start tip, pipe frosting on dessert.