Pat the chicken thighs dry with a paper towel. Season the chicken liberally with kosher salt and black pepper on both sides.
Heat the oil in a large skillet over medium heat. Once the oil is glistening, add the seasoned chicken, skin side down into the oil. Cook the chicken for 10-12 minutes, or until the skin is browned and the fat has rendered. Flip the chicken over and continue to brown for 3-4 minutes more. Skip this step if you are using skinless chicken thighs.
Place 2 cups long-grain white rice in a fine-mesh strainer and rinse under cool running water until the water runs mostly clear. Shake dry and add to base of the slow cooker.
Add 2 cups low-sodium chicken stock, 8 cloves garlic, 2 teaspoons fresh thyme thymes, ½ teaspoon Italian Seasoning, 1 dried bay leaf, and 1 teaspoon of kosher salt, into the slow cooker and stir to combine.
Place the seared chicken thighs, skin side up, on top of the rice mixture.
Place the lid on the crockpot and cook on high for 2-3 hours, or until chicken has reached 165℉ and the rice is tender. If after 1½ hours you notice the mixture drying out, add ¼ cup additional chicken stock. Note on timing: I find 3 hours to be perfect for most standard models. For newer, all-clad models, the cook time is closer to 2 or 2-½ hours.
Once the rice and chicken are fully cooked, remove the chicken to a serving platter and add the juice of the fresh lemon to the rice. Fluff with a fork and serve with fresh parsley.
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Notes
Skinless Chicken Thighs: Skip searing the meat. Simply season to taste with salt and pepper and add to the slow cooker on top of the rice. Storage: Let cool slightly, transfer to an airtight container, and store for up to 3 days in the refrigerator. To reheat, I recommend heating the rice and chicken separately for best results. Reheat the chicken thighs by broiling them under high heat to keep the skin crispy. Reheat the rice in the microwave with a splash of water or broth in 30-second intervals until warmed through.