Heat oil in a dutch oven / pot. Add in onion and garlic. Cook until onion is tender
Add in chicken pieces, chicken broth and undrained tomatoes, thyme, saffron, and ground red pepper. Bring to boil, reduce heat. Simmer and cover for 15 minutes
Stir in the uncooked rice, covered, about 15 minutes more or until rice is nearly tender. Add in prawns, sweet pepper, and peas into the rice mixture. Simmer, covered, about 5 minutes more or until the rice and chicken are tender and shrimp turns pink