Combine smoked paprika, mixed herbs, garlic powder, onion powder, salt, and pepper in a small bowl and mix well. Rinse the basmati rice in cold water until clear, then set aside.
Place the chicken thighs in a large bowl, add all but a teaspoon of the seasoning blend, and toss to coat the chicken evenly.
Heat olive oil in a large pot over medium-high heat. Add the chicken thighs skin side down and cook for about 3 minutes per side until nicely browned. Remove the chicken and set aside on a plate. If there is excess oil, blot some with a paper towel.
In the same pot, sauté the chopped onions until they become translucent and soft. Add butter and stir until melted.
Add the rinsed rice to the pot and cook, stirring frequently, for 1 to 2 minutes to lightly toast the rice, making sure it doesn’t stick to the bottom.
Pour in the chicken stock, sprinkle in the reserved teaspoon of seasoning, and stir to combine everything. Scrape the bottom of the pot gently to lift any browned bits and avoid burning.
Taste the liquid and adjust salt and pepper as needed.
Nestle the browned chicken thighs on top of the rice mixture. Cover the pot with a lid and simmer over low-medium heat for 15 to 20 minutes, or until the rice is tender and the liquid is fully absorbed.
Once cooked, sprinkle chopped green onions over the dish. Cover again and let it rest for 3 minutes.
Fluff the rice gently with a fork, serve warm, and enjoy your hearty one pot chicken and rice dinner!