Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a large bowl, combine the ground chicken, breadcrumbs, Parmesan cheese, chopped parsley, minced garlic, egg, oregano, salt, and pepper. Mix until well combined but do not overmix.
Scoop out portions of the mixture and roll them into golf ball-sized meatballs. Place the meatballs on the prepared baking sheet.
Bake the meatballs in the preheated oven for 20-25 minutes or until cooked through and golden brown.
While the meatballs are baking, heat olive oil in a large skillet over medium heat. Add the sliced mushrooms and sauté until they are browned and tender, about 5-7 minutes.
Once the mushrooms are cooked, add the chicken broth to the skillet, scraping up any bits from the bottom. Let it simmer for a few minutes. Then, stir in the heavy cream and bring to a gentle simmer.
Once the meatballs are done baking, transfer them to the skillet with the mushroom sauce. Gently stir to coat the meatballs in the sauce.
Let the meatballs simmer in the sauce for an additional 5 minutes to absorb flavor.
Serve the chicken Marsala meatballs over pasta or with crusty bread, garnished with fresh parsley.
Notes
Serve with pasta or crusty bread for a complete meal.