Preheat your oven to 425°F.
Whisk together 1 oz. packet ranch seasoning mix, 1 teaspoon dill weed, 1/2 teaspoon onion powder, 1/4 teaspoon ground black pepper, 1/4 tsp salt, 2 garlic cloves grated and 1/3 cup mayonnaise in a bowl, then set aside.
Mix 3/4 cup Panko bread crumbs, 3/4 cup grated Parmesan cheese, and 3 tablespoons unsalted butter melted in a separate bowl.
Coat each chicken fillet with the mayonnaise mixture, then dredge in breadcrumbs.
Put the breaded chicken fillets on a baking sheet lined with parchment paper.
Bake at 425°F for 12-15 minutes. To make sure the chicken is fully cooked and stays juicy and tender, use an instant-read thermometer to check the internal temperature, which should be at least 165°F.