Toast the bagel thin in the toaster. In a small bowl (I used disposable bowls at the office), whisk the egg whites and add the spinach leaves then season with kosher salt. Cook on HIGH in the microwave for 1 minute 30 seconds, keeping an eye on the eggs so they don’t overflow.
Spread a wedge of the cheese on the toasted bagel thin and add slices of tomato. Spoon the cooked egg out of the bowl in a single patty and place on top of the cheese and tomato, and top with avocado. Season with more salt and hot sauce if desired.
