Sprinkle both sides of the chicken with salt
In a Dutch oven, heat oil over medium-high heat. When oil is hot, add chicken, skin side down, until browned, about 5 to 7 minutes. Flip the chicken, using tongs, and cook on opposite side until golden brown, about 5 minutes. Transfer to plate and set aside.
Reduce heat to medium, add onion and red bell pepper, and cook until translucent, about 7 minutes. Add garlic to the top of the onions and cook until fragrant; 2 minutes or so. Add the tomato and scrape the bottom of the pot removing any of the chicken fat pieces (hello! flavor!!). Next, add spices: cumin, paprika, turmeric, saffron, crushed red pepper and 1 1/2 teaspoons of kosher salt and mix.
Pour in rice and give it a good mix, coating it with the tomato mixture. Cook for about a minute or so. Place chicken atop of rice mixture, and disperse the olives all around atop the rice.
Pour just enough chicken stock to cover the rice, about 3 1/2 cups. Bring the pot to a simmer and then reduce heat to low. Cook, covered, for about 30 to 34 minutes, and until rice is tender.
Note: Throughout the cooking process, I checked on it every 15 minutes or so and topped it off with about 1/4 cup of stock each time. In the end, I added 4 cups of chicken stock total. Also, in the last 15 minutes, I salted to taste, adding about 1/4 teaspoon more salt.
When it's ready, turn the heat off. Sprinkle the peas on top and cover with a lid for 2 minutes. Just until the peas are thawed and bright green. Serve immediately.
Leftovers: This stays good in the fridge for up to 3 days. It's great reheated in the microwave. You may need to add a splash of water to it to loosen it up right before the microwave!