Rinse the escarole thoroughly, chop it into bite-sized pieces, and set it aside.
- Heat olive oil in a large skillet over medium heat. Add the minced garlic and chopped hot cherry peppers (along with red pepper flakes if using) to the skillet and sauté for 2-3 minutes until fragrant.
- Add the chopped escarole to the skillet, stirring to coat in the garlic and pepper mixture. Cook for 5-7 minutes, until it begins to wilt and reduce in volume.
- Pour in the chicken broth and cook for another 2-3 minutes, until the liquid has reduced by about half.
- Season the escarole with salt and pepper to taste.
- Preheat your oven to 375°F (190°C). Transfer the cooked escarole mixture to a baking dish and top with Parmesan, shredded mozzarella, and breadcrumbs.
- Bake for 15-20 minutes, or until the cheese is melted and bubbly, and the top is golden brown.
- Remove from the oven, let cool slightly, and garnish with extra grated Parmesan cheese, if desired.