Whisk together the eggs, egg whites, sea salt, and black pepper in a small bowl until well combined.
Heat the olive oil in a non-stick skillet over medium-low heat.
Pour the egg mixture into the skillet and cook, stirring gently with a spatula to create soft curds.
When the eggs are nearly set, sprinkle the shredded parmesan cheese over the top and fold gently until the cheese is melted and the eggs are fluffy.
Toast the sprouted grain bread slices until they are golden and firm.
Mash the avocado in a small bowl or slice it thinly, then spread it evenly across one slice of the toasted bread.
Layer the cheesy scrambled eggs on top of the avocado and finish with the crisp romaine lettuce.
Place the second slice of toast on top, press down gently, and slice the sandwich in half to serve.