These were a great use of our bumper cherry tomato crop. Very tasty and came together easily. We ate them as snacks but they would make a great appetizer. I used red onions because I didn't have shallots and I think next time I would sauté the onions/shallots a bit. I also used all parmesan cheese, instead of parmesan and fontina. We didn't miss the fontina at all. If you are making them for a party, make them on the same day you are going to serve them--they got soggy when stored in the fridge.
Made these for a Labor Day party and everyone loved them! So easy to make. I used fresh tarragon instead of fresh thyme and cut them into little bites - just one pop in the mouth! I made them to take to a party about an hour before I left house and I served them at room temperature. Delicious!! Will definitely make them again.