Preheat grill to high heat.

Brush corn with 2 teaspoons oil. Place green onions, avocado, bell pepper, poblano, and corn on a grill rack coated with cooking spray. Grill onions 2 minutes on each side or until lightly browned. Grill avocado 2 minutes on each side or until well marked. Grill bell pepper 6 minutes on each side or until blackened; peel. Grill poblano 9 minutes on each side or until blackened; peel. Grill corn 12 minutes or until beginning to brown on all sides, turning occasionally.

Cut kernels from ears of corn; place in a large bowl. Chop onion, bell pepper, and poblano; add to bowl. Add remaining 4 teaspoons oil, cilantro, juice, cumin, salt, black pepper, and beans to bowl; toss well. Cut avocado into thin slices; place on top of salad.