In a large pot or dutch oven, heat the olive oil over medium-high heat.
Season the chicken thighs with salt, pepper, oregano, thyme, and smoked paprika. Add the chicken to the pot and sear until browned on both sides (about 4-5 minutes per side). Remove the chicken from the pot and set aside.
In the same pot, add the chopped onion and minced garlic. Sauté for 2-3 minutes until the onion is translucent and fragrant.
Stir in the rice, lemon zest, and lemon juice. Cook for an additional minute while stirring to toast the rice slightly.
Pour in the chicken broth and mix well. Return the chicken thighs to the pot, nestling them into the rice.
Bring the mixture to a boil, then reduce the heat to low, cover, and simmer for 20 minutes. If using, add the frozen peas in the last five minutes of cooking.
After 20 minutes, remove the pot from heat and let it sit, covered, for an additional 5 minutes.
Fluff the rice with a fork and garnish with fresh parsley before serving.