Remove the skin from the rotisserie chicken and shred the meat into bite-sized pieces. Set aside.
In a large pot or Dutch oven, combine the shredded chicken, chicken broth, tomato sauce, chopped red potatoes, lima beans, corn, sugar, salt, pepper, ground red pepper, oregano, poultry seasoning, and dried minced onion flakes.
Stir all the ingredients together until well combined. Bring the mixture to a gentle boil over medium heat.
Once boiling, reduce the heat to low and let the stew simmer for about 30-40 minutes, allowing the flavors to meld and the vegetables to become tender.
As the stew simmers, taste and adjust seasonings if necessary.
Once the vegetables are tender, remove the pot from heat. Ladle the Brunswick stew into bowls and serve hot.