Preheat the oven to 350°F (180°C)
Drizzle the breast with olive oil and season both sides with cumin, oregano, paprika, salt and bake in the center of the oven for 20-25 minutes until cooked through.
Combine spinach, chickpeas, grape tomatoes, in a large bowl. in a small bowl stir together mustard, white vinegar, salt, and black pepper and add to the spinach, toss gently to coat.
Arrange spinach mixture on a plate top with chicken slices.