Heat the vegetable oil in a large skillet or Dutch oven over medium heat.
Add the chopped onion and sauté for about 5 minutes until it becomes soft and translucent.
Stir in the minced garlic and cook for an additional minute until fragrant.
Add the chicken thighs to the skillet, skin side down, and cook for about 5-7 minutes until browned. Flip the chicken and brown the other side.
Sprinkle the paprika, salt, and black pepper over the chicken. Stir to coat the chicken with the spices.
Pour in the chicken broth and bring to a simmer. Cover the skillet and let it cook for 25-30 minutes, or until the chicken is cooked through and tender.
While the chicken is cooking, mix the sour cream and flour together in a small bowl until smooth.
Once the chicken is done, remove it from the skillet and set aside.
Reduce the heat to low and slowly whisk the sour cream mixture into the remaining sauce, stirring until well combined.
Add the sliced bell peppers to the sauce and simmer for an additional 5 minutes.
Return the chicken to the skillet, coating it in the sauce. Heat through for another 2-3 minutes.
Serve hot, garnished with fresh parsley, over egg noodles or dumplings.