Season the chicken with salt and pepper. Heat 1 tablespoon oil in a Dutch oven and brown the chicken on both sides, about 6 minutes total. Transfer to a plate.
Blend the bell peppers, half the onion, garlic, and ginger until smooth.
Cook the Jollof Base:
Add the remaining oil and sliced onion to the Dutch oven. Cook until softened, about 5 minutes.
Stir in the blended pepper mixture, crushed tomatoes, tomato paste, thyme, curry powder, and bay leaves. Cook until thick and darkened, 15 to 20 minutes.
Steam and Serve:
Stir in the rice and hot stock. Nestle the chicken into the rice, cover tightly, and cook over low heat until the rice is tender, 25 to 30 minutes.
Meanwhile, fry the plantain slices in a skillet with the remaining oil until golden on both sides.
Rest the jollof covered for 10 minutes. Fluff gently, scatter with cilantro, and serve with fried plantain.
Notes
The base must reduce before the rice is added.
Do not stir during the covered steaming stage.
Add a splash of stock if the rice needs more time and the pot looks dry.