Coat a small skillet with cooking spray and heat over medium-high heat. Add mushrooms and eggplant; cook, stirring, until lightly browned and juices have been released, 3 to 5 minutes. Remove from heat and set aside.
Toss spinach with 1 Tbsp. plus 1 tsp. vinaigrette and place on a 9-inch plate.
Toss couscous with the remaining 2 tsp. vinaigrette and place on top of the spinach. Place salmon on top. Top with the cooked vegetables, dried apricots, and goat cheese.
