Season both sides of the chicken thighs generously with salt, black pepper, dried thyme, and dried oregano.
In a skillet over medium heat, add olive oil. Once shimmering, add diced onions and sauté for 3-4 minutes until translucent. Add minced garlic and sauté for an additional minute until fragrant.
In your slow cooker, place the seasoned chicken thighs at the bottom. Top with the sautéed onion and garlic mixture.
Sprinkle uncooked long-grain rice over the chicken and onions. Pour in chicken broth, followed by lemon juice and lemon zest. Gently stir to combine without disturbing the chicken layer.
Cover the slow cooker and set it on low heat for 6-7 hours or high heat for 3-4 hours until the chicken is tender and cooked through.
Approximately 30 minutes before serving, add frozen peas directly into the slow cooker and gently fold them into the mixture.
For a more homogenous dish, shred the chicken thighs using two forks and fold the shredded meat back into the rice and vegetable mixture.
Serve hot, garnished with freshly chopped parsley.
Notes
Shredding the chicken is optional but enhances flavor distribution.