Rice Bowl with Chipotle Black Beans

Name: Rice Bowl with Chipotle Black Beans
Ingredients: 2 tablespoons extra-virgin olive oil; 2 cups sliced red onion; 4 cups cooked white rice; 1 (15-oz.) can black beans; 1 tablespoon chopped canned chipotle peppers in adobo sauce; ¾ teaspoon kosher salt; 2 cups halved cherry tomatoes; ¼ cup fresh cilantro leaves; ¼ cup sour cream; lime wedges, for serving