Preheat oven to 375 degrees. Spray a 9-inch pie plate with cooking spray. Saute the onion and peppers in the olive oil until the onion is transparent. Add the carrot and spinach, cook until well combined and any liquid has evaporated. Remove from heat and let cool slightly. Sprinkle the Cheddar cheese in the bottom of the pie plate. Mix the egg whites, egg and cottage cheese in a medium bowl. Add salt and nutmeg. Spread spinach mixture over cheese, pour egg mixture over spinach mixture. Bake 35 - 40 minutes until set and golden. Let stand 5 minutes before serving, cut into wedges.