Preheat your oven to 425°F.
In a bowl, whisk together the ranch seasoning, dill weed, onion powder, pepper, salt, garlic, and mayonnaise, then set it aside.
In another bowl, combine the Panko breadcrumbs, grated Parmesan, and melted butter.
Coat each chicken fillet with the mayonnaise mixture, then dredge it in the breadcrumb mixture.
Place the breaded chicken fillets on a baking sheet lined with parchment paper.
Bake at 425°F for 12-15 minutes. To ensure the chicken is fully cooked and remains juicy and tender, use an instant-read thermometer to check the internal temperature, which should reach at least 165°F.