Gather all your ingredients and preheat your oven to 375°F (190°C)., Marinate the chicken by placing the chicken breasts in a large bowl and pouring the buttermilk over them. Toss to coat, cover with plastic wrap, and refrigerate for at least 30 minutes., Prepare the coating by mixing together the panko breadcrumbs, grated parmesan cheese, Italian seasoning, garlic powder, and a pinch of salt and pepper in another bowl., Remove the chicken from the buttermilk, allowing excess to drip off, and dip each piece into the breadcrumb mixture, pressing gently to coat., Arrange the coated chicken breasts in a greased baking dish and drizzle olive oil or melted butter over the top., Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through (internal temperature should reach 165°F or 75°C) and the coating is golden brown., For an extra crispy topping, broil the chicken for an additional 2-3 minutes at the end.