Cook orzo according to package instructions
Add chopped spinach to a large bowl and once orzo is cooked and drained, add the orzo on top (while still hot) and stir together so that spinach wilts
Mix in olive oil, lemon juice, seasonings, cucumber, peppers, tomato, and olives. Season with salt and pepper to taste. Cover with plastic wrap and let refrigerate to cool.
Once cool, mix in crumbled feta and serve!