Prepare the Ingredients. Wash and dry the spinach leaves and arugula, cherry tomatoes, and cucumber. Slice the cherry tomatoes in half, dice the cucumber, and chop the chicken.
Assemble the Salad. In a large salad bowl, combine the spinach leaves, arugula, cherry tomatoes, sliced red onion, diced cucumber, crumbled feta cheese, and toasted almonds.
Toss Gently. Using salad tongs or clean hands, gently toss the ingredients together until evenly distributed.
Serve and Enjoy. Transfer it to individual serving plates or bowls. STop with a small amount of pesto. Serve immediately.