Beef Stroganoff Sandwiches

Name: Beef Stroganoff Sandwiches
Prep time: 15 min
Cook time: 5 min
Total time: 20 min
Cuisine: European, American, Eastern European
Ingredients: 1 lb. ground beef; 1/4 c. chopped onion; 1 t. Worcestershire sauce; 1/2 t. salt; 1/4 t. garlic powder; 1/4 t. pepper; 1 c. sour cream; 1 loaf French bread; 2 tbsp. butter; 1 c. shredded cheese; Optional: toppings such as mushrooms, peppers, tomatoes, etc