1.Preheat oven to 375°F. 2.Warm a medium size pan over medium heat, add butter and vegetables and cook until slightly browned and beginning to crisp. 3.Sprinkle in flour and allow to cook for 45 to 60 seconds. 4.Add the milk, heavy cream, salt and pepper, then whisk and return to a simmer. 5.Pour vegetable-milk mixture into buttered casserole pan and top with shredded Manchego and croutons. 6.Bake for 15 to 20 minutes or until vegetables are tender. Garnish with parsley and serve immediately.