Preheat your oven to 375°F (190°C).
Grate the russet potato using a box grater and squeeze out all excess moisture using a clean kitchen towel or paper towels.
Heat the avocado oil in a medium oven-safe skillet over medium-high heat.
Add the shredded potatoes to the skillet, seasoning with half of the sea salt, black pepper, and garlic powder.
Press the potatoes down firmly and cook for 5-7 minutes until the bottom is golden and crispy.
While the potatoes cook, whisk together the eggs, liquid egg whites, Greek yogurt, smoked paprika, and remaining seasonings in a bowl until smooth.
Roughly chop the fresh spinach and stir it into the egg mixture.
Pour the egg mixture directly over the crispy hash brown base in the skillet.
Transfer the skillet to the oven and bake for 12-15 minutes, or until the eggs are set and slightly puffed.
Allow to cool for 2 minutes before slicing into wedges and serving.