Parmesan Bread Pudding with Broccoli Rabe and Pancetta

INGREDIENTS

• 1 olive oil
• 2 garlic cloves, thinly sliced
• 1/2 crushed red pepper flakes
• 1 medium bunch broccoli rabe (rapini), trimmed, cut into 1/2-inch pieces
• 2 kosher salt plus more
• 1/2 freshly ground black pepper plus more
• 6 large eggs
• 1 1/2 whole milk
• 1/2 country-style white bread, cut into 1-inch pieces (about 8 cups)
• 1/2 plus 2 tablespoons finely grated Parmesan
• 6 thin slices pancetta (Italian bacon)