Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish. Arrange the chicken breasts evenly in the dish, ensuring they don’t overlap.

In a medium bowl, combine the mayonnaise (or Greek yogurt), grated Parmesan, garlic powder, seasoning salt, and black pepper. Mix until smooth and well blended.

Use a silicone spatula to evenly coat the top of each chicken breast with the mixture. Cover them thoroughly but avoid letting it spill into the dish base—it should sit like a thick layer on top.

Place the dish in the oven and bake for 25–30 minutes. Chicken is done when it reaches an internal temperature of 165°F (74°C) and the topping is lightly golden.

For a crispier top, switch to broil mode for the last 2–3 minutes. Watch closely to prevent burning.

Let the chicken rest for 5 minutes before serving. Garnish with chopped parsley or chives if desired.