Now that I am super busy with school, it's a goal of mine to come up with recipes that I can make in large quantities and then freeze for a quick lunch or dinner during the week. Last weekend I looked in my fridge and found some leftover egg yolks that I didn't want to go to waste so I decided to bake them up in a muffin tin for some individual egg "muffins" that I can throw onto an english muffin along with some cheese and ham for a nice breakfast or lunch. Not fancy, but simple and delicious. It works for me!
There is no recipe with this, it is more of an idea. I just whisked together the egg yolks and a few whole eggs with a little milk, salt and pepper. Then just throw in whatever else you want; I did peppers and onions but cheese, or some type of meat would be delicious too. It's kind of like making scrambled eggs but instead of scrambling them in a frying pan, pour them into a (liberally) greased muffin tin and bake. Super easy and very versatile.
One word of caution; you don't want to fill up the muffin tins very full, about halfway is plenty. You can't tell from the pictures, but as they bake the egg really poofs up and you can have a mess on you hands if it all overflows. Once they come out of the oven they collapse and aren't nearly as tall, but mine looked almost like mini soufflés when they were fresh out of the oven.
I bake my little frittatas at 350 degrees for maybe 20-25 minutes. I didn't set a timer, but just kept my eyes on the oven and waited until they all looked set up. Just watch them to make sure they don't overbake. I threw the finished product into the freezer and have been eating them all week, yum!