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