Preheat your oven to 400°F.
In a small bowl, combine olive oil, lemon juice, minced garlic, and chopped rosemary to create the marinade.
Place the chicken breast on a baking sheet and brush generously with the marinade, making sure to coat both sides evenly.
Roast the chicken in the oven for 20-25 minutes or until cooked through and juices run clear.
While the chicken is roasting, rinse the chickpeas and pat dry.
Prepare the fresh vegetables by halving the cherry tomatoes, dicing the cucumber, and slicing the red bell pepper. Toss them together with the spinach in a large bowl.
Once the chicken is done, slice it into strips and add to the vegetable bowl along with the chickpeas.
Drizzle a bit more of the lemon-garlic dressing over the bowl if desired, toss gently, and serve immediately.