Collard Green and White Bean Gratin

Ingredients (11)

• 1 pound collard greens, stems and tough ribs removed
• 5 garlic cloves, divided, 1 crushed and 4 chopped
• 1/4 cup extra-virgin olive oil, divided
• 1 medium onion, chopped
• 1 small red bell pepper, cut into 1/2-inch pieces
• 3 cups cooked white beans, 1/2 cup cooking liquid reserved
• 1/2 cup diced or chopped cooked ham-hock meat, sausage, chorizo, or bacon
• 1/4 cup freshly grated Parmigiano-Reggiano, divided
• 1 tablespoon finely chopped fresh rosemary leaves
• Kosher salt and ground black pepper
• 1/4 cup medium-coarse fresh bread crumbs