1/2 cup quinoa
3 tablespoons extra-virgin olive oil, divided
8 ounces skinless boneless chicken breast halves
12 ounces green beans, trimmed, cut into 1 1/2-inch pieces
2 cups fresh yellow corn kernels (cut from 2 to 3 ears of corn)
3 green onions, thinly sliced (about 3/4 cup)
1 tablespoon minced fresh marjoram
1/2 teaspoon coarse kosher salt
2 tablespoons white wine vinegar
2 tablespoons minced shallot
1 teaspoon Dijon mustard
Cook quinoa using directions on the package. Drain; cool. Meanwhile, heat 1 tablespoon oil in heavy medium skillet over medium-high heat. Sprinkle chicken with salt and pepper. Add chicken to skillet; cook until golden brown and cooked through, about 8 minutes per side. Cool, then cut into 1/2- to 3/4-inch cubes. Cook green beans in large saucepan of boiling salted water until crisp-tender, about 4 minutes. Drain. Rinse under cold water to cool; drain. Transfer beans to kitchen towel; pat dry.
Mix quinoa, chicken, and green beans in large bowl; add corn and green onions. Combine remaining 2 tablespoons oil, marjoram, and 1/2 teaspoon coarse salt in small bowl. Press with back of spoon to release flavor. Whisk in vinegar, shallot, and mustard. Pour over salad in bowl; toss to coat. Season to taste with salt and pepper. DO AHEAD: Salad can be made 1 day ahead. Cover and chill.
Recipe adapted from http://www.Epicurious.com