In a large bowl, season the chicken breasts with olive oil, salt, black pepper, paprika, and dried oregano. Ensure they are well-coated and set aside for 15 minutes for the flavors to marinate.
Rinse jasmine rice under cold water until the water runs clear. In a medium saucepan, combine the rinsed rice and chicken broth. Bring to a boil, then reduce heat to low, cover, and simmer for about 15 minutes or until the rice is tender and the liquid is absorbed. Remove from heat and let it rest for an additional 5 minutes before fluffing with a fork.
While the rice is cooking, heat a large skillet over medium-high heat. Add the marinated chicken breasts and cook for about 6-7 minutes on each side, or until they are golden brown and cooked through (internal temperature should reach 165°F).
Once the chicken is done cooking, transfer it to a cutting board and slice it into strips. In the same skillet, add the diced tomatoes and chopped spinach. Cook for 2-3 minutes until the spinach wilts.
Add the cooked rice to the skillet with the tomato and spinach mixture. Drizzle with lemon juice and mix in the sliced olives and crumbled feta cheese until well combined. Add the sliced chicken on top.
Transfer the Mediterranean Chicken Rice to a serving platter. Garnish with fresh parsley and additional feta if desired.