Over medium high heat, brown the ground beef and onion in a large skillet. Add mushrooms and garlic; cook 2-3 more minutes over medium heat. Drain off any grease.
Add the paprika, pepper, salt, and flour, stir until meat is coated.
Add broth, worcestershire, and dry pasta. Bring to a boil, then reduce heat to low. Simmer uncovered, for 10-12 minutes, or till pasta is tender and most of the liquid is evaporated.
Stir in the sour cream. We like it with just 3/4 cup, but you can add more. Heat through and serve immediately.
Notes
Smoked paprika really does add great flavor to this dish! Regular paprika works, but it turns out a little more bland.