Heat the vegetable oil in a large skillet or Dutch oven over medium heat.
Season the chicken thighs with salt and pepper, then add them to the skillet. Brown the chicken on all sides, about 5-7 minutes. Remove the chicken and set aside.
In the same skillet, add the chopped onion and cook until softened, about 3-4 minutes.
Add the minced garlic and diced bell pepper, cooking for an additional 2-3 minutes until fragrant.
Sprinkle the paprika over the onions and peppers, stirring well to combine. Cook for another minute.
Return the browned chicken to the skillet, and add the drained diced tomatoes and chicken broth. Bring to a simmer.
Cover the skillet, reduce the heat to low, and let it cook for 25 minutes, or until the chicken is cooked through and tender.
Remove from heat and stir in the sour cream until well combined. If the sauce is too thick, you can add a little more chicken broth to reach the desired consistency. Adjust seasoning with salt and pepper.
Serve hot, garnished with fresh parsley, over egg noodles or dumplings.