For croutons, in a 1-gallon zipper-type plastic bag, combine KELLOGG'S CRISPIX cereal, chili powder, cumin, and garlic salt. Pour vegetable oil or butter over cereal mixture. Seal bag and gently toss until evenly coated. Store in an airtight container up to 3 days.
In a large bowl combine beans, corn, tomatoes, chiles, onion, and half the cilantro. Toss with 1/3 cup vinaigrette; cover and chill 30 minutes or up to 8 hours. Place greens on platter. Arrange bean salad over greens. Top with remaining cilantro and cereal croutons.
Serve with remaining vinaigrette (if desired). Season salad to taste with salt and pepper.
Whisk together the hot sauce, olive oil, agave nectar, chili powder, salt, lime zest and juice. Season with freshly ground pepper. Serve with Black Bean Salad with Spicy Crispix (TM) Croutons.