Heat the vegetable oil in a large pot over medium heat. Add the onion, bell pepper, and garlic, and sauté until the vegetables are softened, about 5 minutes.
Stir in the cumin, oregano, paprika, and turmeric, and cook for an additional 1-2 minutes until fragrant.
Pour in the chicken broth, water, and diced tomatoes. Bring to a boil.
Stir in the rice, reduce the heat to low, and cover the pot. Simmer for about 15 minutes, or until the rice is almost cooked through.
Stir in the cooked chicken, peas, and corn. Continue to simmer for another 5-10 minutes, or until the rice is fully cooked and the vegetables are tender.
Season with salt and pepper to taste. Stir in chopped cilantro if using.
Enjoy your meal!