How can I make my pie fuller?

I wanted to make an easy oreo pie so went to the store got ingredients and came home and realized I only had 1 pkg of pudding mix, how can I make this pie fuller? I have: 1 choc crust, milk, whipped topping, oreo cookies, 1 pkg of oreo pudding mix... Any suggestions would be appreciated, the only other pudding mix I have in pantry is pistachio one.