Cook the orzo pasta according to box instructions. Make sure to salt the water well, drain and set aside.
In a medium pan, add one tablespoon of olive oil over medium high heat. After five minutes, add half of the mushrooms and cook undisturbed for five minutes. You are looking to get a nice sear on one side to give a nice flavor. Stir and cook for an additional five to seven minutes to release their water. Salt to taste and set aside.
Once the orzo is cook, add it to a large mixing bowl with the mushrooms, swiss chard, onion, herbs and feta. Mix the lemon zest, juice, olive oil, salt and pepper together. Pour over the salad and mix well until combined. Taste for seasoning.