I got this egg-free mousse recipe from here, a long time ago:
1 container Rich’s Whip
⅓ c. cocoa
1 t. vanilla
½ c. sugar
Whip together. Pour in graham cracker crust. Top with recipe below:
1 container Rich’s Whip. Whip. Add:
1 tsp. vanilla
2 tsp. confectioner’s sugar
I make the white part first so I don't have to wash the parts from the chocolate in between.
Freeze. Its rich so you don't need large servings.