In a large skillet, cook beef over medium heat until no longer pink, 8-10 minutes, breaking into crumbles; drain. Transfer to a greased 3- or 4-qt. slow cooker. Stir in Velveeta, soups and seasonings. Cook, covered, on low until heated through, 1-1/2 - 2 hours, stirring halfway through cooking. Serve warm with tortilla chips.