Stir together sage, marjoram, pepper and salt. Rub on both sides of chops. Spray large nonstick skillet with cooking spray; heat over medium heat. Place chops in skillet. Cook 5 minutes, turning once, or until chops are just barely pink.
Remove chops from skillet; keep warm.
Add onion and garlic to skillet; cook and stir 2 minutes. Add mushrooms and broth. Bring to a boil. Reduce heat and simmer, covered, 3 to 4 minutes or until mushrooms are tender.
Whisk together sour cream, flour and mustard in medium bowl. Whisk in about 3 tablespoons broth from skillet. Stir sour cream mixture into skillet. Cook, stirring constantly, until mixture comes to a boil. Serve over pork chops and noodles. Sprinkle with parsley, if desired.