Pre-heat oven to 375°F.
Combine 1 tsp of salt, Lemon Pepper Dill Seasoning, black pepper, and smoked paprika until mixed. In a medium bowl, season chicken with the spice mix and rub them in to distribute evenly. Set aside.
Heat a large oven safe skillet (one that has an oven safe lid) over medium-high heat (8 out of 10). Add vegetable oil and heat until shimmery. Add chicken thighs, "smooth" side down, being careful not to overcrowd the skillet. Sear for 2-3 minutes until the chicken is browned on one side and releases from the skillet. Remove the chicken to a plate and set aside.
Add onion, carrot, and celery to the hot skillet. Sauté for 2-3 minutes until fragrant, then add garlic and rice. Sauté for another 1-2 minutes to toast the rice.
Add broth, juice of 1 lemon, and remaining 1/2 tsp of salt to the skillet. Stir, scraping up any browned bits from the bottom of the pan. Cover and bring to a boil over medium-high heat (7 out of 10) for 5 minutes.
Turn off the heat, then add sprigs of thyme and rosemary and nestle the chicken thighs and 3-4 lemon halves (cut side up) on top of the rice mixture.
Cover the skillet and bake at 375°F for 40-45 minutes or until the rice has absorbed most of the liquid. Uncover and broil for about 5 minutes to brown the chicken and lemons. Remove from the oven and rest for 5-10 minutes. Top with flakey sea salt before serving, if desired.