Line a 4¼-inch x 8-inch loaf pan with plastic wrap.
Combine cream, powdered sugar, and vanilla in a medium bowl.
Beat with an electric mixer fitted with a whisk attachment to medium stiff peaks. Set aside.
Place 8 oreos flat in bottom of pan.
Top with ⅓ of whipped cream.
Repeat layers 2 more times.
Cover with plastic wrap.
Refrigerate at least 12 hours, or overnight.
When ready to serve, lift out of pan and remove plastic wrap.
Place on desired serving tray.
Decorate as desired.