Bring a medium pot of water to a gentle simmer and stir in the white vinegar.
Crack the two poaching eggs into individual small ramekins to prepare for poaching.
In a small heat-proof bowl, whisk together the single egg yolk, Greek yogurt, melted ghee, lemon juice, and Dijon mustard until completely smooth.
Place the sauce bowl over the pot of simmering water, ensuring the bottom doesn't touch the water, and whisk constantly for 2-3 minutes until the sauce thickens into a velvety glaze.
Season the hollandaise sauce with sea salt and black pepper, then remove from heat and cover to keep warm.
Create a gentle whirlpool in the simmering water with a spoon and carefully drop in the eggs, poaching for approximately 3 minutes until the whites are set but the yolks remain liquid.
While the eggs poach, lightly sear the Canadian bacon in a non-stick skillet over medium heat and toast the English muffin half until golden.
Place the toasted muffin on a plate, layer with the seared Canadian bacon, and carefully top with the poached eggs using a slotted spoon.
Drizzle the warm yogurt hollandaise over the eggs and serve immediately.