In a large soup pot brown hamburger and onions. Drain. Add the potatoes and enough water to completely cover the potatoes. Add the beef bouillon cubes and the rest of the seasonings. Boil about 15 minutes are until the potatoes are fork tender.
When potatoes are fork tender, add the can of tomato soup. Stir well then remove half a can (using the soup can) of the stew's liquid. To this add the heaping teaspoons of chili powder, flour and sugar. Mix these in the can really well then add to the stew pot and stir well. Let the stew simmer for about another 15 minutes or so. Serve with warm rolls or crushed crackers.