In a skillet over medium heat, add olive oil and sear the chicken breasts for about 3-4 minutes on each side until they're golden brown. This step adds flavor but can be skipped if short on time.
In the slow cooker, add the diced onion, minced garlic, and long-grain white rice, ensuring an even layer.
Season the chicken with salt, pepper, paprika, lemon zest, and thyme. Place the seasoned chicken breasts on top of the rice.
Pour chicken broth and the lemon juice over the chicken and rice.
Cover the slow cooker and set it to low for 6-7 hours or high for 3-4 hours.
In the last 30 minutes of cooking, add the frozen peas to the slow cooker without lifting the lid.
Once cooked, shred the chicken slightly, mixing it into the rice. If desired, sprinkle chopped parsley over the top before serving.
Notes
Serve the chicken and rice in shallow bowls, garnished with additional lemon slices and fresh parsley for a bright and appealing look.