Directions
Preheat your oven to 375°F (190°C).
In a large skillet, heat the olive oil over medium-high heat. Add the chicken pieces, season with salt and pepper, and cook until browned and cooked through, about 5-7 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add the chopped onion and cook until translucent, about 3 minutes. Add the garlic and mushrooms, and cook until the mushrooms are browned and tender, about 5 minutes.
Stir in the dried thyme, chicken broth, and heavy cream. Bring the mixture to a simmer and let it cook for about 5 minutes, allowing the sauce to thicken slightly.
Return the cooked chicken to the skillet and stir to combine. Transfer the mixture to a baking dish.
Sprinkle the mozzarella and Parmesan cheeses evenly over the top.
Bake in the preheated oven for 20-25 minutes, or until the cheese is bubbly and golden brown.
Remove from the oven and let it cool for a few minutes before serving. Garnish with fresh parsley if desired.