How to Make It
Set up a plancha for cooking (see Note for technique).
In a large bowl, toss beans with oil. Transfer beans to plancha and arrange in a single layer. Cook beans until charred on one side, 2 to 3 minutes. Use a long-handled spatula to toss beans. Cook until tender, 1 to 3 minutes, depending on type and freshness of beans.
Use spatula to transfer cooked beans to bowl; add chili-lime salt. Toss to coat beans, and serve immediately.