Since making these cookies, I've been thinking of other various items that could be put in the middle.
The first "alternate item" idea I had was M&M's.
I actually thought of this the day after Mothers Day (the occasion I originally made the cookies for), and was slightly disappointed that I had not thought of it earlier so there could have been an "M for Mom theme". But the originals worked out perfectly well anyways.
So FINALLY, I decided to experiment and make these M&M Shortbread Cookies.
Before baking. As with the raspberry version, I indented and "M&M-ed" before refrigerating to avoid cracking.
So were they good?
M&M's and shortbread? I really can't see how that could be a recipe for anything but goodness.
Any other suggestions for what would be a delightful addition to the shortbread?