Dice the Yukon Gold potato into small, even cubes for quick cooking.
Heat half of the avocado oil in a non-stick skillet over medium-high heat.
Add the diced potatoes to the skillet and cook until they are golden brown and crispy, approximately 10 minutes.
Slice the chicken sausage into rounds and add them to the skillet with the potatoes, browning for 3-4 minutes.
While the sausage browns, whisk the whole egg and egg whites together in a small bowl.
Remove the potato and sausage mixture from the pan and set aside.
Add the remaining oil and the baby spinach to the pan, sautéing until just wilted.
Reduce the heat to medium-low and pour the egg mixture over the spinach.
Gently scramble the eggs until they are almost set, then sprinkle the sharp cheddar cheese over the top.
Continue to stir until the cheese is melted and the eggs are fluffy.
Serve the cheesy eggs immediately alongside the crispy potato hash and sausage.