Preheat the oven to 350 degrees F (if baking as a separate casserole dish).

In a medium-sized saute pan over medium heat melt the butter. Add the diced prosciutto and allow to cook until it starts to turn brown and turns crispy on the edges, about 5 minutes.

Add the onion and garlic and continue to cook until the onion begins to soften.

Stir in the chopped chestnuts and ½ cup of chicken broth and let simmer until liquid is reduced by half.

Turn off heat and stir in diced apple, Parmesan cheese, egg, toasted bread chunks, and remaining ¾ cup chicken broth.

Use mixture to stuff your turkey or transfer to a 8" x 8" or 9" x 9" square baking dish and bake until golden brown on top, about 20 – 25 minutes.