Blue Cheese Burger

1½ pounds medium ground beef 2 teaspoons salt 2 teaspoons pepper 3 ounces spreadable cream cheese 3 ounces crumbled blue cheese 1 tablespoon Keens mustard   Pre-heat barbecue to medium heat. Mix together ground beef, salt and pepper. Divide into 8 equal portions and flatten burgers to about ¼ inch thick. Use a 6” dessert…