Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Dice the Russet potato into small, uniform 1/2-inch cubes to ensure even roasting.
Toss the potato cubes on the baking sheet with olive oil, sea salt, black pepper, and garlic powder.
Spread the potatoes in a single layer and roast for 20-25 minutes, flipping halfway through, until golden and crispy.
While the potatoes roast, whisk together the whole eggs and liquid egg whites in a medium bowl until the mixture is uniform.
Heat the ghee in a large non-stick skillet over medium-low heat.
Pour the egg mixture into the skillet and let it sit for 30 seconds before using a silicone spatula to gently push the curds toward the center.
When the eggs are nearly set but still moist, fold in the baby spinach and cook for 30-60 seconds until just wilted.
Remove from heat immediately and serve the fluffy scramble alongside the hot roasted potatoes.