Bake chocolate cake according to directions on package. Use a wooden spoon to poke holes.
Make vanilla instant pudding.
Pour pudding over cake, filling in all the holes.
Spread pudding evenly across cake and refrigerate.
Mix Oreo cookie crumbs and Cool Whip.
Spread evenly over the poke cake.
Refrigerate and add remaining Oreo pieces just before serving.
Serve and enjoy!!!