Thoroughly rinse any fresh produce and pat dry. Trim cucumber, halve lengthwise, then cut into ½” half-moons. Quarter apple and remove core. Cut into thin slices. In a mixing bowl, combine dressing, guacamole, 2 Tbsp. water, and a pinch of salt and pepper. Add spinach, apple, cucumber, and Brussels sprouts. Gently toss to combine. Garnish with Parmesan. Bon appétit!