Rinse and cook the rice until tender, then keep warm.
If not using pre-cooked chicken, season and cook until golden, then shred.
In a skillet, sauté onions, garlic, and mushrooms in butter until soft.
Add flour to the skillet and whisk continuously to form a golden roux.
Gradually add chicken broth while whisking, followed by heavy cream.
Return shredded chicken to the skillet, add peas, and simmer.
Stir in sour cream, season to taste, and serve over hot rice with fresh parsley.