Season beef with a sprinkle of salt and pepper. In a medium skillet heat olive oil, sear beef strips quickly just until brown on both sides, don't overcook, remove to plate as done. Set aside.

In same skillet add mushroms, add more oil if needed and cook 2 minutes, add onion, garlic and chilis, cook until tender.

Combine beef broth, sour cream, worcestershire sauce, pepper, and hot sauce in small bowl, whisk to blend. Add to skillet with vegetables and heat through. Return beef to skillet, cover all with cheese. Cover skillet and heat over low heat to melt cheese.

When cheese is melted, remove from heat, uncover and fill lettece cups with cheese steak mixture.and serve hot.