Heat oven to 425°F. Coat a baking sheet with cooking spray; spread chips evenly on sheet. In a bowl, combine beans, pepper, corn and cumin; spoon over chips. Top with olives, jalapeños and cheese; bake until cheese melts, 5 to 6 minutes. In same bowl, combine tomato, onion, cilantro and juice; gently mix in avocado. Serve nachos topped with salsa.