I make homemade Egg McMuffins and freeze them -- English Muffin, precooked sausage patty or bacon, processed cheese slice, scrambled egg round -- and then reheat a couple minutes in microwave.
I use English Muffin rounds for cooking the eggs so they are round and the correct size, but you can do it any way that is convenient. The egg is scrambled so it freeze well. EggBeaters are ideal for this purpose.
Bacon is oven fried so it stays flat and I flash freeze them before bagging so they stay apart. Very easy to add to the sandwich before going in to freezer. Corners of the cheeze are folded in so they don't drip down the sides when eventually heated. The cheese changes a little in the freezing but its not noticed in the sandwich.
Support bacteria. It's the only culture some people have.