This entrée is similar to the famous chicken dish called country captain, but the fiery seasonings and sides make it uniquely Caribbean. If you can't find plantains, the dish is equally good without them.
Combine first 6 ingredients in a bowl; toss to coat. Cover and refrigerate 1 hour, turning occasionally.
Remove chicken from marinade, reserving marinade; sprinkle chicken with 1/2 teaspoon salt and pepper. Heat oil in a large nonstick skillet coated with cooking spray over medium-high heat until hot. Add chicken; sauté 1 minute per side or until browned. Add reserved marinade, remaining 1/4 teaspoon salt, tomatoes, water, and serrano chile; bring to a boil. Cover, reduce heat, and simmer 1 hour. Discard chile. Top each chicken breast with tomato mixture; serve with Down-Island Salsa, Sautéed Plantains, and rice. Garnish with thyme sprigs and lime wedges, if desired.