Heat oven to 375 degrees F. In bowl, mix together tomatoes, onion and cilantro. Squeeze lime into the tomato mixture and toss until blended.
Arrange a single layer of chips on heatproof platter or baking sheet. Top with spoonfuls of chili, tomato mixture, olives and cheese. Add jalapeno slices, if desired. Repeat layers until all the ingredients are used.
Bake 15 minutes or until cheese is completely melted. Serve nachos hot.