Cook noodles according to package directions. Drain; keep warm.
In extra-large skillet cook mushrooms and garlic in hot oil over medium-high heat 5 to 8 minutes or until tender, stirring occasionally. (Reduce heat if mushrooms brown quickly.) Remove with slotted spoon; cover to keep warm.
For sauce, in bowl combine sour cream, flour, paprika, and 1/4 teaspoon pepper. Stir in broth until smooth. Add to skillet. Cook and stir until thickened and bubbly; cook and stir 1 minute more. Serve mushroom mixture and sauce over noodles. Sprinkle with parsley. Serves 4.