1
Adjust rack to middle position and preheat oven to 450 degrees. Wash and dry produce.
Place 2 TBSP butter (3 TBSP for 4 servings) in a medium microwave-safe bowl. Microwave until melted, 30 seconds. Let cool slightly.
While butter cools, finely chop walnuts or crush in their bag with a heavy-bottomed pan or rolling pin.
Add walnuts, panko, half the oregano (all for 4), ¼ tsp salt (½ tsp for 4), and pepper to bowl with melted butter. Stir to combine.