Season the chicken breasts with salt, pepper, garlic powder, and onion powder.
Warm the olive oil in a skillet over medium-high heat and brown the chicken breasts on each side for 2 to 3 minutes; then place them into the slow cooker.
In a bowl, stir together the uncooked rice, chicken broth, lemon juice, dried thyme, and dried oregano.
Pour the rice and broth mixture evenly over the chicken in the slow cooker.
Arrange lemon slices on top of the rice to infuse extra flavor.
Cover the slow cooker and cook on low for 6 to 7 hours or set to high and cook for 3 to 4 hours.
About half an hour before it’s time to eat, check that the chicken has reached an internal temperature of 165°F.
Remove the chicken and fluff the rice gently with a fork, adjusting seasonings if needed.
Serve the chicken either shredded or whole on the bed of rice and sprinkle with fresh chopped parsley.