In a large skillet, heat olive oil over medium-high heat. Add corn and cook, stirring halfway through, until lightly browned and tender, 5 to 6 minutes. Remove from heat and let cool completely.
In a large bowl, combine corn, lima beans, tomatoes, feta, green onions, basil, Dijon, lemon juice, vinegar, salt, and pepper, tossing until well combined. Cover and refrigerate until ready to serve. Garnish with basil, if desired.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/succotash-salad/