Using a potato masher, mash beans and juice into fine pieces, but not a paste; set aside.
In medium saucepan over medium heat, cook and crumble beef and chili powder until beef is no longer pink; drain.
Stir beans and undrained tomatoes into pan; bring to a simmer. Simmer 10 minutes, stirring occasionally, or until thickened.
Place cooked hot dogs into toasted buns; top with chili, cheese and onions.
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