In a skillet, cook chicken in hot oil over medium-high heat for 4 to 5 minutes until no longer pink. Remove chicken and set aside.
Add mushrooms, onion, and garlic to skillet. Cook, uncovered, for 4 to 5 minutes until liquid evaporates. Set aside.
In a small bowl, stir together sour cream, flour, seasoned salt, and pepper.
Add sour cream mixture, milk and broth to mushroom mixture in skillet. Cook and stir until thickened and bubbly.
Add marjoram, basil, oregano, and lemon juice and cook for an additional minute. Add chicken and sherry; heat thoroughly.
Serve over prepared warm herbed biscuits.