Season meat with cumin, salt, and pepper; set aside. Heat 1 tablespoon oil in 12-inch skillet or wok over medium-high heat; add garlic, stir-fry 15 seconds. Add half the beef at a time; stir-frying for 2 to 3 minutes or until done, and setting aside. Return beef to skillet; add broth; bring to boiling.
Add pasta, sweet peppers, and onions to skillet. Cook, uncovered, 2 to 3 minutes,.
until pasta is tender. Stir in the 1/2 cup salsa and oregano; heat through. Ladle into bowls; twirl pasta into nests. Top with salsa and pepper mix.