In a medium bowl, mix the orzo, tomatoes, spinach, green onions, fetamint and sour cream; set aside.
Preheat oven to 350. Coat a 9x9 baking dish with nonstick spray; set aside.
Slice the tops off the peppers. Remove and discard the membranes and seeds. Stand peppers upright (if necessary, cut a small slice off the bottom so that they are stable). Divde the orzo mixture among the peppers. Place upriht in the prepared baking dish.