Using the sitz toilet bowl with flushable cat litter.  She has no problem going #1, but seems to be a little apprehensive with #2.

Here she is with all four paws on the seat dropping a deuce!  She had her rear paws in at first but pulled them up after a stink bomb touched it. 

Just what everyone wants to see.  She'll keep it in as long as possible, but luckily she doesn't relieve herself on the carpet, the linoleum, or anywhere else in the apartment.  She'll jump up, dig, meow, run around, then finally return knowing that she has to do it here.  At least she knows where to go.