I’ve been fortunate enough for 2+ years to have the time every morning to make my own breakfast (eggs + sausage or bacon, in various iterations). That appears it will change fairly soon, and I like maintaining a high protein diet.
It seems like mini quiches are one of the few options for a portable, high protein breakfast.
Are you going to be able to heat whatever you take with you? Do you object to a carb component?
If Yes and No, how about a breakfast casserole or a frittata? Make them ahead of time and take a serving to warm up. Lots of easy and tasty recipes out there.
I do something like this for breakfasts and they are goooood. Having some place to warm them up makes a big difference. I tweak the ingredients, using whatever leftover meat and veg I have on hand.
If you’re okay with a low carb tortilla, you can make a dozen or so breakfast burritos at a time and freeze them for whenever. To heat at work, wrap in paper towel & microwave 2 minutes.
As long as the filling isn’t very wet, you’re fine. My last batch was scrambled eggs, crumbled cooked chorizo sausage (drained, but not fanatically so) and a sprinkle of sharp cheddar cheese, and it’s been fine. I used the “medium” size of wrapper (not as big as a full sized burrito tortilla; a bit bigger than a taco). To be clear, you don’t have to use a lowcarb tortilla. You can use a regular one too. Whatever works.
I’d add the burrito doesn’t have to be closed by a large margin of tortilla. As you make each one, fold it into a piece of tinfoil. It will freeze closed as long as there’s enough tortilla to cover the filling. Remove tinfoil before microwaving.
Individually wrapped in tinfoil, then stored together in a ziplock bag, they should keep a couple weeks.
With quiche, I prefer no flour or carb-like ingredients at all. I pour eggs beaten with milk on top of my fillings and bake. It comes out pretty firm, works fine in muffin cups.