Stuffing: Using a food processor, Blend all the stuffing ingredients on low until blended. Don't worry if some bits are chunky, it adds to the flavour. If you don't have a blender then chop onion and prunes finely and mix with other ingredients until sticky.
To Assemble: Preheat the oven to 180 degrees C.
Make a thin sausage out of the stuffing and wrap in a piece of schnitzel . Only wrap the schnitzel around the stuffing once, then trim off the excess. Use a toothpick to secure or just place in dish with the seam down. Repeat with all pieces of schnitzel (some will be smaller as using the trimmed leftovers - but great for the kids).
Place in oven dish and add the tin of tomato sauce, or tins of tomatoes over the top.
Bake for 30-45 minutes (until the schnitzel has gone from pink to brown) then add cheese and serve once cheese has melted.