In a saucepan, over medium to low heat, add olive oil, onions, garlic, and rosemary stirring constantly for 4 minutes.
Add fire roasted diced tomatoes and sugar, simmer, stirring, until liquid is evaporated.
Add Italian seasoning, chili flakes, and chicken broth, stirring often and bring broth to a boil and reduce heat, add Cannellini beans, simmer for 20 minutes. Remove Rosemary Sprig from Stew.