I would definatly call it more of an icing than filling, and the layer is actually a semi-thin one but it is SO sweet that it almost overwhelms the cookie part. Honestly even though it's not even reaching the sides of the cookie it is more than enough!
I just bought a box of the extra large ones and the cream/cookie ratio is wonderful! Only problem I have is walking past them without grabbing one. The large ones are huge. I need to get a box of smaller ones next time so I eat less
No there's not a lot of filling. I believe that's there's more cookie than filling which evens out the sweetness of the filling. The cookies are so soft, chewy, and delicious! This makes a great snack to eat at home or on the go.