Cut the chicken breasts into cubes. Heat the olive oil in a saucepan over medium heat, and cook the chicken about 10 minutes.
Stir the cooked chicken, raisins, broccoli, spinach, and onion in a large bowl.
To make the dressing, whisk the olive oil, vinegar, sugar, and cinnamon in a small bowl. Pour over the salad. Toss gently to coat evenly.
Serve immediately.