Butternut Squash Cheddar Gratin with Rosemary Breadcrumbs

Bahan-bahan (10 porsi)

• ¼ cup (½ stick) unsalted butter
• 2 medium sweet onions, (peeled and thinly sliced)
• 2½ pounds butternut squash (peeled and seeded), (cut into 1/2-inch cubes)
• 1 teaspoon granulated white sugar
• ½ teaspoon salt
• ½ teaspoon freshly ground black pepper
• ½ cup low sodium chicken or vegetable broth
• 2 cups Panko breadcrumbs
• 2 cups packed grated sharp white cheddar cheese
• 1 tablespoon chopped fresh rosemary
• ½ teaspoon dried thyme