Preheat your oven to 375°F (190°C). Lightly grease a 9 × 13-inch baking dish.
Arrange the chicken breasts in a single layer in the prepared baking dish. Pat them dry with paper towels.
In a small bowl, combine the mayonnaise or Greek yogurt, freshly grated Parmesan cheese, garlic powder, seasoned salt, and black pepper. Stir until everything is smooth and well combined.
Spread the creamy Parmesan mixture evenly over the chicken breasts, making sure each piece is completely covered.
Place the baking dish in the preheated oven and bake for 35–45 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the topping is golden brown and bubbly.
Let the chicken rest for about 5 minutes. Garnish with freshly chopped parsley if desired, and serve warm with your favorite side dishes.