In a medium saucepan set over medium heat, heat the chicken broth and 1 teaspoon sesame oil until just boiling. Stir in the couscous and cover the pan; remove from heat and let stand for 5 minutes. Fluff the couscous with a fork.
Meanwhile, in a shallow dish, combine the flour, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, chili powder, 1/4 teaspoon salt, and 1/4 teaspoon pepper.
Using a basting brush, brush 1 teaspoon of the Marsala cooking wine over the fish fillets. Coat both sides of the tilapia with the flour mixture.
In a large skillet set over medium heat, heat 1 tablespoon sesame oil and 1 tablespoon Marsala cooking wine. Add the fish to the preheated skillet and cook 4 minutes on both sides, or until the tilapia is slightly browned.
In a large bowl, toss the spinach, carrots, and green onion with the cooked couscous. In a small dish, mix the extra 1 tablespoon sesame oil, 1 tablespoon Marsala cooking wine, 1/2 teaspoon garlic powder, 1/2 teaspoon onion powder, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Pour the oil mixture over the salad and toss until it is fully coated.
Serve 1 cup salad with 1 tilapia filet. Sprinkle with salt and pepper before serving.