Oh my, no taxy, have never seen them in the store. This is a recipe from, at a guess, the 50's or 60's. So easy. Never done a 'search' for them, are they even out there? will have to check it out.
Edit:
So, yup, there are recipes out there and all are almost identical. Black and green olives vary. I use only black (canned). Have done them with a mix of black and green but didn't like them. I stick to the black olives. I will post mine if you'd like. If you follow a recipe from out there, my advice is to NOT add the salt they usually call for. Between the olives and the cheese they are plenty salty enough.
Mix, spread, quarter, freeze. 10 min at 400 (frozen or not) - great snack. Might even have some more tonight. I often package them up in sandwich baggies so I only need to take out a certain amount at a time.