In a large bowl, add spinach, tomatoes, cucumber and feta cheese.
Drizzle with oil, then season with salt and pepper.
Using tongs, toss gently. Adjust seasonings to taste and serve immediately.
Notes
Store: Like any spinach salad, it tastes best when consumed within 2 hours. However, if you have any leftovers you can pop them in a sealed container in the refrigerator for up to 24 hours. The next day, I would not offer it to guests but it makes quick and healthy lunch possible.