Make 1 (1/2 inch deep) cut in each chicken piece; sprinkle evenly with 1/4 teaspoon salt and 1/4 teaspoon pepper.
Heat a large Dutch oven over high heat. Add oil to pan; swirl to coat. Place flour in a shallow dish. Dredge chicken in the flour. Add the chicken to the pan; cook 5 minutes on each side. Remove the chicken from the pan.
Add shallots, garlic, and rosemary to the pan; cook 2 minutes or until tender, stirring frequently. Add the win to the pan; brink to a boil. Cook for 1 minute; scrapng pan to loosen browned bits.
Add the remaining 1/4 teaspoon salt, remaining 1/4 teaspoon pepper, chicken stock, sugar, tomatoes, and bay leaf. Bring to a boil; return the chicken to the pan.
Reduce heat to medium; cook, partially covered, 15 minutes or until the chicken is done, turning once. If sauce is thin, make a slurry with cornstarch and water to thicken. Sprinkle with chopped parsley.