Meanwhile, to create the cheese sauce, combine the broth and flour in a 2qt. saucepan and whisk well.
Add remaining ingredients, whisking to keep the mixture smooth. Bring to a low 'bubble.'
Pour over the vegetables and stir with a wooden spoon to combine the vegetable water in the bottom of the pan with the sauce, until everything is well coated. Cover and return to a 300° oven for 20 minutes. Uncover and cook at 400° - with or without Italian flavored panko breadcrumbs - for an additional 15 minutes, stirring halfway through. . .Lin