1
Adjust rack to top position (top and middle positions for 4 servings) and preheat oven to 425 degrees. Bring 2 TBSP butter (4 TBSP for 4) to room temperature. Wash and dry produce.
Using a heavy-bottomed pan or rolling pin, crush walnuts in their bag until finely ground. In a small bowl, combine walnuts, panko, a large drizzle of olive oil, salt, and pepper.