Streuseled Sweet Potato Casserole

Bahan-bahan (18 porsi)

• 5 pounds peeled and 1-inch cubed sweet potatoes ((about 14 cups))
• ½ cup half and half cream
• ½ cup maple syrup
• 1 teaspoon vanilla extract
• ¾ teaspoon salt
• 1 large egg, (lightly beaten)
• ½ cup all purpose flour
• ½ cup packed brown sugar
• ¼ cup (½ stick) chilled butter, (cut into small pieces)
• ½ cup chopped pecans