Directions:
Preheat your oven to 375°F (190°C) and grease a 9x13 casserole dish.
Place chicken breasts in casserole dish.
In a bowl, mix sour cream, 1/2 cup grated Parmesan cheese, salt, pepper, oregano, garlic powder, and cornstarch until well combined.
Top each breast with a slice of mozzarella cheese.
Spread the sour cream mixture evenly over the chicken breasts. Sprinkle rest of Parmesan cheese over the dish.
Bake for 60 minutes, or until the chicken is cooked through and the cheese is melted and bubbly.
Remove from the oven and let it rest for a few minutes before serving.
Garnish with parsley, if desired, and serve hot.
I await your comments! Enjoy!