How to Make It
Preheat oven to 400°F. Sprinkle chicken with pepper and 3/4 teaspoon of the salt. Heat 1 tablespoon of the oil in a large cast-iron skillet over medium-high until shimmering; add chicken, and cook until browned on both sides, 3 to 4 minutes per side. Transfer to a baking sheet, and bake in preheated oven until a thermometer inserted in thickest part registers 165°F, 12 to 13 minutes.
Meanwhile, add 2 tablespoons of the oil to skillet; swirl to coat. Add green beans, corn, and scallions; cook, stirring occasionally, until beans are bright green and slightly charred, about 4 minutes. Add red bell pepper; cook, stirring occasionally, until slightly softened, about 2 minutes. Add zucchini; cook until charred and tender-crisp, about 4 more minutes. Remove from heat, and stir in tomatoes and 1/2 teaspoon of the salt.
Remove chicken from oven, and let stand 5 minutes. Meanwhile, combine vinegar, tarragon, and remaining 1/4 teaspoon salt in a small bowl. Whisk in remaining 2 tablespoons oil until combined. Slice chicken, and serve over salad. Drizzle with dressing.
If you choose frozen vegetables for this recipe, pat them dry before adding to the skillet so they char (rather than steam) in the pan.