1 1/4 cups long-grain brown rice
1/4 cup cornstarch
1 pound snow peas, trimmed and halved crosswise
4 garlic cloves, sliced
2 teaspoons fresh ginger, grated and peeled
3 tablespoons light-brown sugar
2 tablespoons soy sauce
1/2 teaspoon red-pepper flakes
2 large egg whites
Coarse salt and ground pepper
1 pound boneless, skinless chicken breasts, cut into 1-inch pieces
2 tablespoons vegetable oil, such as safflower