Oreo Creme Cake

1 pkg (2-layer size) devils' food chocolate cake mix AND according ingredients
4 oz semi-sweet chocolate (Use a good baking chocolate bar!)
1/4 cup butter
1 pkg. (8 oz.) cream cheese, softened
1/2 cup sugar
2 cups thawed Cool Whip
12 Oreo cookies, crushed

Bake cakes, as directed on package in 2 (9-inch) round pans. Cool cakes in pans 10 minutes and invert onto wire racks. Gently remove pans. Cool cakes completely.
Microwave chocolate and butter in a small microwave-safe bowl on HIGH for 2 minutes or until butter is melted. Stir until chocolate is melted. Cool 5 minutes.
Meanwhile, beat cream cheese and sugar until blended. Gently stir in thawed Cool Whip and crushed cookies. Stack cake layers on plate, spreading cream cheese mixture between layers. Spread top with chocolate glaze. If glaze becomes too thick, microwave on high 20-30 seconds or until desired consistency. Let stand until firm. Keep refrigerated.