Prepare the couscous: Cook according to package directions. Mix in raisins when couscous is cooked.
Prepare the chicken: Moisten the chicken with a little water and then coat with the breadcrumbs. Heat the oil in a large nonstick skillet over medium-high heat, and add the garlic and chicken. Fry about 5 minutes on each side, or until the chicken is cooked through.
To make the sauce: Grate zest from one orange. Place the zest in a small saucepan with the juice from the two oranges and the soy sauce. Gently boil for 1 minute. Add the scallions.
To serve: On each of four plates, place a handful spinach leaves and top with hot cooked couscous. Place a cooked chicken breast on top of couscous and drizzle sauce on top.