Boil water in a large pot and add a pinch of salt.
Cook the tortellini according to package instructions until al dente.
Drain the tortellini and rinse under cold water to stop cooking.
In a large mixing bowl, combine the cooked tortellini, cherry tomatoes, and spinach.
Add the sliced olives and crumbled feta cheese to the bowl.
In a small bowl, whisk together olive oil, balsamic vinegar, salt, and pepper.
Pour the dressing over the salad and toss gently to combine.
Let the salad sit for 10 minutes to allow flavors to meld.
Garnish with fresh basil before serving.
Serve chilled or at room temperature.