Preheat oven to 375F and spray or grease a large oven-safe skillet (I use a Le Creuset Enameled Cast-Iron 10-¼-Inch Skillet , skillets from 9 to 12 inches in diameter will work). Add the rice to the skillet, covering the base in a flat layer (I don't bother unthawing the frozen fried rice and add it straight from bag to skillet). Sprinkle the vegetables and optional protein evenly over the rice. Add the soup and lightly spread it using a spatula because it's thick. Pour eggs evenly over the top of the soup. Drizzle with olive oil, sprinkle with seasoning blend, and salt and pepper to taste.
Bake for about 45 to 50 minutes, or until top is golden browned and set, and edges have crisped up. Remember that if cooking in cast iron, there is a notable carryover cooking effect so food will continue to cook in the skillet and don't wait to pull frittata from oven until it's very browned because with carryover cooking factored in, it will become very tough. Slice and serve immediately. Slice leftover fritatta into wedges and wrap in plasticwrap or store in an airtight container in the refrigerator for up to 3 days.
