I try to spend at least one day a month making a whole bunch of breakfast foods to freeze.
This is one of our favorites:
I use silicone muffin cups. In 12 muffin cups, add whatever meat, cheese, veggies, etc that you would like in your eggs. We do spinach and feta, ham and cheese, bacon (pre-cooked) and cheese, peppers and tomatoes, etc.
In a large bowl, mix 12 eggs, about 1/2 cup of milk, and salt and pepper, and mix.
Pour the egg and milk mixture into the muffin cups. Extra cheese can be added to the top.
Then bake them at 350 for 25-30 mins.
I freeze them in the silicone cups, in ziploc bags. To thaw them, I put them in the fridge the night before we want to eat them. They can be microwaved for about 30 mins if they are in the fridge, or 2-3 mins from the freezer.