Heat oven to 350°F. Spray 11x7-inch (2-quart) baking dish with cooking spray. In 6-inch skillet, heat olive oil over medium heat. Add bell pepper and green onions; cook 2 to 3 minutes, stirring occasionally, until bell pepper and onions start to soften. In large bowl, mix bell pepper mixture and all remaining ingredients except croutons. Spoon into baking dish. Top with croutons.