Season the chicken thighs with kosher salt and ground black pepper. Place them in a large mixing bowl and pour the ranch dressing over. Allow the chicken to marinate for about 10 minutes.
Heat olive oil in a large sauté pan over medium-high heat. Add the marinated chicken thighs and brown for about 3 minutes on each side, until golden. Remove the chicken and set aside.
Add more oil if necessary, then sauté the diced onion and bell pepper for 2-3 minutes until softened. Stir in minced garlic and cook for 30 seconds.
Deglaze the pan with a splash of low-sodium chicken broth, scraping up any brown bits. Add dry white rice and toast for 1 minute.
Stir in frozen peas and carrots, ranch seasoning, and remaining chicken broth. Mix well.
Return chicken thighs to the pan, nestling them into the rice mixture. Cover, lower heat to medium, and cook for about 20 minutes.
Check if rice has absorbed liquid and is cooked through. If not, add a bit more broth and cover again.
Once cooked, remove from heat. Fluff the rice with a fork and season with more salt and pepper if desired. Garnish with fresh parsley.
Serve hot and enjoy your delicious Ranch Chicken and Rice!