PREHEAT oven to 350° F.
COMBINE spinach soufflé, cream cheese, ½ cup Parmesan cheese, mayonnaise and 2 tablespoons green onion in a medium bowl. Transfer to a small baking dish; sprinkle with 1 tablespoon Parmesan cheese. Place baking dish in center of baking sheet or ovenproof platter.
ARRANGE tortilla chips around dip. Sprinkle chips with tomatoes, chopped green onions and Monterey Jack cheese.
BAKE for 20 to 25 minutes or until dip is hot and Monterey Jack cheese is melted.