Cook the orzo in a large saucepan of well-salted water per instructions, drain, reserving ¼ cup of the pasta cooking water, then pour the drained orzo back into the pot.
Add the baby spinach, grape tomatoes, kalamata olives, red onion, olive oil, lemon juice, sea salt, freshly cracked lemon pepper, and oregano to taste. Stir until evenly mixed. Add a bit of reserved pasta water as needed.
Pour into a serving dish and top with feta cheese. Enjoy.