1/2 cup soy sauce
2 tablespoons firmly packed light brown sugar
2 tablespoons rice vinegar (unseasoned)
1 teaspoon Asian chile garlic sauce (or 1/4 teaspoon dried red pepper flakes)
1 tablespoon cornstarch
2 tablespoons Toasted sesame oil
4 tablespoons peanut oil
2 medium zucchini or summer squash (cut into 1/2-inch dice, about 1-1/2 cups)
1 tablespoon minced garlic
2 tablespoons grated and peeled fresh ginger
4 cups broccoli florets (bite size, about 8 ounces)
1 yellow bell pepper (stemmed, seeded and cut into 1/4-inch strips)
1 1/2 pounds boneless, skinless chicken breasts (cut into 1/2-inch cubes or 1/4-inch strips)
1/2 cup thinly sliced scallions (including white and 3 inches of green)
3 cups cooked rice or soba noodles (for serving)
1/2 cup cashews (for garnish)