Roasted Sweet Potato and Black Bean Salad

Name: Roasted Sweet Potato and Black Bean Salad
Ingredients: Vegetable oil cooking spray; 2 large sweet potatoes (about 1 1/2 pounds), peeled and cut into 1-inch pieces; 1 teaspoon salt, divided; 1/2 teaspoon freshly ground black pepper, divided; 1/4 cup fresh lime juice, plus wedges for garnish; 1 tablespoon balsamic vinegar; 1 tablespoon finely chopped garlic; 1 can (15 ounces) black beans, rinsed and drained; 1 cup halved cherry tomatoes; 1/2 cup thinly sliced orange or red bell pepper; 1/2 cup thinly sliced scallions; 1/3 cup chopped fresh mint; 4 cups baby arugula