Chicken:
Melt 2 tablespoons butter in a large skillet over medium-high heat. Add the onion and cook until slightly soft, about 2 minutes. Add the mushrooms and cook, stirring, until they begin to brown, about 2 minutes. Add the remaining 1 tablespoon butter, the chicken, flour, paprika, 1 teaspoon salt and 1/4 teaspoon pepper. Cook, stirring, until the chicken browns, about 3 minutes. Add the chicken broth and Worcestershire sauce and bring to a gentle simmer; cook until thickened, about 5 minutes. Stir in the sour cream and season with salt and pepper. Continue simmering gently until the chicken is cooked through, about 2 more minutes.Garnish with parsley.
Rice:
In a medium saucepan, melt the butter. Add the onion, cover and cook over low heat until translucent, 5 minutes. Stir in the rice and garlic. Add the water and 1 teaspoon of salt and bring to a boil over high heat. Cover and cook over moderately low heat for 10 minutes until tender. Using 2 forks, lightly fluff the rice. Gently stir in the herbs, season with salt, cover with the towel and the lid and let stand for up to 30 minutes before serving
