These can be whipped up pretty quickly for a nice breakfast treat.
bread or ham for the casing (optional)
Corn, peas and/or spinach
mixed herbs, salt & pepper (or other spices to taste)
Lightly grease a muffin tin. If using bread as the casing, cut the crusts off and roll the bread flat, then use a cookie/scone cutter to make rounds, press these into the muffin tins. You can also use pieces of ham for a low-carb version (ham with no splits works better otherwise the egg leaks through). You can make them without anything in the pan, but they may stick a little more.
Mix all the ingredients together to your preferred taste. You could add other ingredients in there – experiment to find something you like. Bake in the oven for about 15 mins until the egg has set.