Cook seasoning in a large saucepan over medium heat 2 minutes or until toasted, stirring frequently. Combine fajita seasoning, corn, 1 tablespoon juice, and cilantro in a medium serving bowl.
Combine onion and next 3 ingredients in a medium serving bowl. Combine avocado and remaining 2 teaspoons juice in a small serving bowl, tossing gently to coat. Combine dressing and chipotle in a small serving bowl.
Place lettuce in a large serving bowl. Place chicken in a medium serving bowl. Place cheese, chips, mango, green onions, and radishes in individual serving bowls. Arrange bowls buffet-style, beginning with lettuce and ending with dressing. For each serving: 1 1/2 cups lettuce, 3/4 cup bean mixture, 1/4 cup corn mixture, about 1/3 cup chicken, 3 tablespoons chips, 3 tablespoons cheese, 2 tablespoons mango, 2 tablespoons onions, 1 tablespoon radishes, 1 tablespoon avocado, and 1 1/2 tablespoons dressing.
For baby: To prepare Southwestern Chicken Dinner for baby, place 1/4 cup chopped cooked chicken, 1/4 cup cubed peeled avocado, 1/4 cup chopped peeled mango, and 1 tablespoon water in a food processor; process until desired consistency. Yield: about 1/2 cup.
For baby: To prepare Southwestern Bean Mash for baby, place 1/4 cup drained canned black beans, 1/4 cup cubed peeled avocado, 1/4 cup chopped peeled mango, and 1 tablespoon water in a food processor. Process until desired consistency. Yield: about 1/2 cup.
Kitchen Tip Baby's version can be served as small finger foods instead of processed once he's ready for it.