In large skillet, heat oil over medium-high heat until hot but not smoking. Add beef and cook 3 to 4 minutes, turning once. Add onion and cook 5 minutes, stirring onion occasionally. Transfer beef and onion to 3 ½ to 4 quart slow cooker. Stir in garl
Transfer beef to cutting board. Cut beef into bite-size pieces. Return beef to slow cooker, stirring to combine ingredients. Spoon beef mixture over chips. Sprinkle cheese and desired toppings over beef.