Make an incision on one side of each prune to open it up, and insert a block of cheese and a pecan. Pinch the prune shut in your hand to secure. Wrap each prune with a piece of the prosciutto, and secure with a toothpick. Line a baking sheet with a silicone mat or parchment paper, and arrange the prunes one inch apart with the prosciutto seam up to bake.
Roast the prunes for 7 minutes, and remove from the oven. Serve immediately.
Make it dairy free & Paleo-friendly by omitting the Parmesan cheese!