Preheat oven to 400°. Whisk the first 10 ingredients until combined. Place chicken, peppers, broccoli and peas in a foil-lined 15x10x1-in. baking pan. Drizzle with soy sauce mixture; toss to coat. Sprinkle with cashews. Bake until chicken is no longer pink and vegetables are crisp-tender, 15-20 minutes.