In a medium bowl, combine breadcrumbs, cheese, oregano, salt, and pepper. Drizzle with 2 tablespoons of the olive oil, mixing until the breadcrumb mixture is evenly moistened and resembles wet sand. Set aside.
½ cup plain breadcrumbs, ½ cup freshly grated Pecorino-Romano or Parmesan cheese, 1 teaspoon kosher salt, ½ teaspoon freshly ground black pepper, ½ teaspoon dried oregano, 4 Tablespoons olive oil
Thoroughly wash the escarole to remove any grit. Add the entire head of escarole to a large pot of boiling water to blanch for 1-2 minutes until bright green. This helps reduce some of the bitterness.
1 head escarole
Transfer the escarole to a colander and rinse well under cold water to stop the cooking process. Drain well. Chop the escarole into 2-inch pieces and set aside.
Heat the broiler. Heat the remaining 2 tablespoons of olive oil in an oven-safe pan over medium-high heat. Add the onion, prosciutto, peppers, and garlic. Sauté for 4 to 5 minutes until the onions have softened and the prosciutto is crispy.
½ medium yellow onion, 2 ounces prosciutto or pancetta, ¼ cup hot pickled cherry peppers, 3 cloves garlic
Add the chopped greens and half of the breadcrumb mixture, stirring until everything is evenly combined and cook over medium heat for 2 to 3 minutes, stirring frequently. Remove from the heat and sprinkle the remaining breadcrumb mixture on top of the greens.
Broil for 2-3 minutes until toasted on top.