For the eggs: Preheat the oven to 375 degrees F. Spray the bottom and sides of an 8-inch square baking dish with cooking spray.
In a medium bowl, whisk the bean sprouts, eggs and garlic.
For the rice: In a large bowl, combine the rice, peas and carrots, soy sauce and chicken. Add the egg mixture and toss to coat. Gently pat into the prepared dish. Cover with aluminum foil. Bake, removing the foil about 10 minutes into baking, until the eggs have set and the casserole is golden brown, 20 to 25 minutes.
For the topping: Serve topped with the fried onions, scallions and a squirt of sriracha to taste.