Baked Potato Soup with Broccoli and Red Pepper

Yukon Gold potatoes*

red pepper (seeded and chopped)

frozen chopped broccoli (if the pieces are too big, chop them into smaller bite sized pieces)

scallions (white and green parts thinly sliced)

low-sodium vegetable broth

reduced-fat milk

reduced-fat sour cream (plus additional for garnish, if desired)

cornstarch

salt

freshly ground black pepper

Shredded cheddar cheese (optional)