Preheat your oven to 400°F and line a baking sheet with parchment paper.
Season the chicken breast with half of the sea salt, black pepper, and curry powder, then place it on one side of the baking sheet.
Peel the plantain and slice it into half-inch rounds, then place them on the other side of the baking sheet, lightly misting with a tiny bit of oil if desired.
Bake the chicken and plantains for 20 to 25 minutes until the chicken reaches an internal temperature of 165°F and the plantains are golden and tender.
While the chicken bakes, heat the olive oil in a small saucepan over medium heat and sauté the diced red onion and bell pepper until softened.
Stir in the tomato puree, thyme, smoked paprika, and the remaining curry powder, cooking for 2 minutes to develop the flavors.
Add the parboiled rice and chicken broth to the saucepan, bringing the mixture to a boil.
Reduce the heat to low, cover tightly, and simmer for 15 to 18 minutes until the liquid is fully absorbed and the rice is tender.
Fluff the rice with a fork and serve it alongside the sliced baked chicken and sweet plantains.