Preheat oven to 450°.
To prepare meatballs, combine first 5 ingredients. Shape mixture into 32 (3/4-inch) meatballs; place on a broiler pan coated with cooking spray. Bake at 450° for 12 minutes or until done. Set aside.
To prepare the soup, place the tortilla strips in a single layer on a jelly-roll pan coated with cooking spray. Bake at 450° for 5 minutes or until lightly browned. Set aside. Heat the oil in a large saucepan over medium heat. Add 1 cup onion, poblano, and garlic; cook for 5 minutes, stirring occasionally. Stir in 1/2 cup salsa and the next 4 ingredients (salsa through tomatoes); reduce heat, and simmer for 10 minutes. Stir in the meatballs; cook for 5 minutes or until thoroughly heated. Ladle the soup into individual bowls, and top with the tortilla strips, diced avocado, and chopped cilantro.