Preheat the oven to 350°F.
Remove the stems from the mushrooms, chop them, and reserve the caps.
24 large fresh mushrooms, button or cremini mushrooms work great
Heat 2 tablespoons of oil in a large sauté pan. Add the onion and cook until softened, about 5 minutes. Add the chopped stems and cook over high heat until they begin to dry, about 5 minutes. Stir in the garlic and cook until fragrant, about 30 seconds. Transfer the mixture to a bowl and set aside.
4 tbsps olive oil, 1/2 cup chopped yellow onioin, 1 tbsp minced garlic
Heat the remaining 2 tablespoons of oil in the same pan. Add the pork and cook, breaking it up with a spoon, until fully cooked. Stir in the cinnamon, nutmeg, fennel seed, and orange zest. Add the cooked mushroom-onion mixture and bread crumbs, mixing well. Season to taste with salt and pepper.
1/2 lb ground pork, 1/2 tsp ground cinnamon, 1/4 tsp ground nutmeg, 1 tsp fennel seed, 1 tbsp grated orange zest, 1/4 cup dried bread crumbs, salt and pepper
Stuff the pork mixture into the mushroom caps. Place the mushrooms in a baking pan and drizzle chicken broth around them.
1 cup low-sodium chicken broth
Bake for about 20 minutes, until the mushrooms are cooked through.
Place the mushrooms on a platter, drizzle with the pan broth, and serve warm.