Preheat the oven to 200C/180C fan, and lightly grease a 6-cup muffin tray.Add the eggs to a bowl and whisk. Add the chicken.Add the spinach (Spinach should not be given to cats with renal or urinary issues. You can substitute spinach with vegetables such as green beans and peas) and mix to combine.Lightly oil the muffin tray.Pour the mixture evenly into the muffin tray, until halfway full.Bake the egg cups in the oven for 18-20 minutes, until cooked through and golden brown on top. You can check for doneness by poking a cocktail stick into the centre — it will come out clean when done.When cooled it's time for your cat to enjoy!