In a small skillet, fry the pancetta over a medium heat until crispy. Set to one side.
Using a blender, add the eggs, cottage cheese, shredded cheddar cheese, salt, and pepper. Blitz until smooth, around 20 seconds.
Grease 6 small mason jars with lids. Sprinkle each jar with some Gruyère cheese and a few pancetta pieces — around a teaspoon each.
Pour the egg mixture into jars around ¾ full. Carefully screw on the lids, but not too tightly, then place the jars into the sous vide. Cook for 45 minutes, until they're set.
Use tongs to remove the egg bites from the water bath and let them cool for around 10 minutes. Then, carefully remove the lids and use a knife to remove your egg bites from the jars. Serve them with a sprinkle of more Gruyere cheese on top.
You can also serve them in jars and use spoons to eat them.