Spray 12-inch nonstick skillet with nonstick cooking spray. Heat over medium-high heat until hot. Add beef and onion; sprinkle with garlic salt. Cook 4 to 6 minutes or until beef is browned, stirring frequently.
Add gravy, broth and paprika; mix well. Stir in uncooked noodles and peas. Bring to a boil. Reduce heat to medium-low; cover and cook about 10 minutes or until beef and noodles are tender, stirring occasionally. Stir in sour cream until well blended.