Heat oven to 350 F. Line two large rimmed baking sheets with foil. Arrange half of the chips on pans and top with some cheeses, beans, onion, and jalapeño. Repeat layers for two to three layers total. (These can be assembled up to one hour before baking.)
Working with one sheet at a time, bake until cheese is melted, 10 to 15 minutes. Sprinkle with cilantro, scallions and olives if desired and serve with desired toppings. Heat a second pan as the first for fresh, hot nachos.
This is your chance to add all of the things Mexican that you love - layer upon layer. Enjoy1Crunchy chips with loads of toppings for hungry party-goers are easy to make when you do it in the oven.