Preheat the oven to 175 degreese Celsius.
Whisk eggs in a bowl until small bubbles start to form on the surface.
Add milk, salt and black pepper to the bowl and whisk again.
Add sundried tomatoes, olives, feta cheese and yellow cheese (if using) to the egg batter.
Grease the muffins tins unless your using silikon or non stick muffins tins.
Divide the batter into muffin tins, filling them 7/8.
Bake in the oven for 15-20 minutes, until the eggs are set and golden brown.
Let cool for a few minutes and remove from the tins.