1. Preheat oven to 400°F.
2. Cook onion in olive oil in medium skillet over medium-high heat 5 min. or until tender. Add tomato and chiles; cook 2 min. Transfer mixture to a large bowl; add spinach, cheeses and olives, stirring well.
3. Spoon mixture into a buttered 2-quart baking dish. Bake, uncovered, for 30 to 35 min. or until golden and bubbly. Serve warm with tortilla chips.
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