#1. In medium bowl, whisk broth and seasoning. In 5- to 6-quart slow cooker, add steak, onion and broth mixture cover and cook on high 4 hours or low 8 hours or until steak is very tender and falls apart. With 2 forks, shred steak in slow cooker. #2. Preheat oven to 400° spray rimmed baking pan with cooking spray. Spread chips on prepared pan top with cheeses and steak mixture. Bake nachos 12 minutes or until golden brown and cheese melts. Makes about 9 cups. #3. Serve nachos sprinkled with onions.