PREPARE the Dijon vinaigrette. Combine the olive oil, white balsamic vinegar, Dijon mustard, and Swerve in a bullet blender or small mason jar. Blend or shake vigorously until well combined. Season to taste with salt and pepper.
ADD the baby spinach to a large bowl or serving platter. Arrange the sliced red onion, sliced apple, chopped egg whites, chopped broccoli, and sliced yellow pepper on top.
JUST before serving, drizzle the dressing over the top and toss until well combined.