Cut beef, across the grain, into 1 ½ - 2 inch strips, ½ inch wide.
Place meat in large baggie with ½ cup flour. Shake to coat.
Add 2 tablespoons butter to pan and melt over medium high heat.
Cook meat until browned on all sides and sprinkle with seasoning during cooking.
Add remaining butter to pan and cook onions and jalapenos until tender. Add garlic and cook for an additional minute or two.
Pour beef broth and heavy cream to meat mixture.
Bring to a boil, reduce heat and let simmer until sauce thickens.
Cook pasta according to package directions. Drain and add pasta to meat mixture.
Stir in sour cream until combined.
Serve hot and enjoy!