Cut the sirloin into 1 inch cubes. Put the steak into a crock pot.
Sprinkle the chili powder, garlic powder, and cumin over the meat.
Add the chopped onion and green pepper to the crock pot. Drain
and rinse the black beans and add to the crock pot. Add the
tomatoes with their juice, sugar, and crushed red pepper. Cover
and cook on low for 8 to 10 hours.
Uncover and stir in the tomato paste. Season with salt and fresh
ground pepper to taste. Serve and enjoy with sour cream, cheddar
cheese, chopped onions or tortilla chips if desired.