The description at Ruby Tuesday's site is different than yours, however, yours sounds divine and shouldn't be difficult to put together.

From the site:
Chocolate Tallcake®
Layered chocolate cake and mousse with caramel and chocolate sauces, ice cream and whipped cream.

The Ruby Tuesday dessert menu I read was as follows:

Layered chocolate cake, chocolate mousse & Oreo cookies topped with caramel and chocoalte sauces, vanilla Blue Bell Ice cream & whipped cream. $5.99

I don't have a recipe & have never tasted it but it shouldn't be too difficult to recreate & assemble the various components. Is there anything especially different about the cake or the mousse?

Here is a link that might be useful: Ruby Tuesday Dessert Menu

I think my main problem is incorporating the oreo cookies into the cake somehow. And believe it or not, I've never used mousse in a cake before.

I'm not familiar with this dessert but I image a chocolate cake w/a mousse filling & the mousse is sprinkled w/oreo crumbs & repeating to create another layer & then topped w/caramel and chocolate sauces & a dollop of whipped cream w/ice cream on the side. Don't know if I'm close, that's what I've come up with.

Lucy

Here's a picture of the tallcake. Not exactly what I was thinking. Are the oreos actually in the cake itself or in the filling?

Here is a link that might be useful: tallcake pic

I'm pretty sure they're actually in the cake. I'd like to make this cake for my hubby and I's 2-year anniversary on the 6th, so any help would be much appreciated!

This isn't the recipe but it incorporates Oreo cookie crumbs into a boxed cake batter so just follow the technique with a chocolate cake recipe.

Here is a link that might be useful: Oreos in cake

Hm, that should help. Thanks, ginger!