Cook meat in a large saucepan over medium-high heat until meat is browned, stirring until it crumbles. Drain, if necessary.
While meat cooks, drain and mash 1 can of beans. Add mashed beans, undrained beans, salsa, tomato sauce, and seasoning mix to saucepan; stir well. Cook over medium heat 10 minutes or until thoroughly heated.
Spoon into serving bowls. If desired, top with sour cream and shredded cheese.