How to Make It
Heat a large nonstick skillet over medium-high. Add oil to pan; swirl to coat. Add onion, and cook, stirring occasionally, until tender, about 4 minutes.
Add edamame; cook, stirring constantly, 2 minutes. Add corn; cook, stirring constantly, 2 minutes. Remove from heat. Transfer to a bowl; cool 10 minutes. Stir in tomatoes, feta, dill, parsley, vinegar, salt, and pepper.