Step 1: Prepare the chicken and vegetables

• Preheat your oven to 375°F (190°C).
• In a 9×13-inch baking dish, lay the thinly sliced chicken breasts in a single layer.
• Top the chicken with a layer of fresh baby spinach, followed by a layer of sliced mushrooms.

Step 2: Season the dish

• Sprinkle pepper and herb and garlic seasoning evenly over the spinach and mushrooms.

Step 3: Make the creamy sauce

• Soften the green onion cream cheese by letting it sit at room temperature for a few minutes.
• In a medium bowl, whisk together the softened cream cheese, olive oil, and chicken broth until smooth and well combined.

Step 4: Assemble and bake

• Pour the cream cheese mixture evenly over the chicken, spinach, and mushrooms in the baking dish.
• Lay a piece of foil loosely over the top of the dish, ensuring it does not seal completely.

Step 5: Bake in stages

• Place the dish in the preheated oven and bake for 20 minutes covered.
• Remove the foil and continue baking uncovered for an additional 20-25 minutes.
• Sprinkle the shredded mozzarella cheese over the top and bake uncovered for another 10 minutes, or until the cheese is melted and lightly browned.

Step 6: Rest and serve

• Let the dish cool for about 10 minutes before serving to allow the flavors to set.