Conchitas con Carne (Mexican Hamburger and Shells)

Ingredients :

1lb ground sirloin  
2 cups uncooked shells  
4 oz tomato sauce  
1/4 small onion chopped  
1/4 bell pepper sliced  
4-5 cups water  
1 beef bullion cube  
1 tsp cumin  
1 tsp chili powder  
1 tsp paprika  
1/4 tsp cayenne pepper (optional)  
1 tsp garlic powder  
1/4 tsp salt  
1/2 tsp pepper  

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