Preheat oven to 400. In a bowl combine all ingredients except egg whites and skim milk. Coat either a deep muffin pan or a regular muffin pan with cooking spray and spoon in spinach mixture. In a separate bowl whisk together egg whites and skim milk. Spoon over spinach mixture and then bake for 50 minutes. The cups that looked super full will cook down, let cool and then store in freezer or fridge, microwave 1 minute to warm up.