In a small heat-safe bowl, whisk together the egg yolk, Greek yogurt, lemon juice, and cayenne pepper until completely smooth.
Slowly whisk in the melted ghee to create a creamy emulsion, then set the bowl over a pot of warm water to keep the sauce tempered.
Fill a medium saucepan with water and the white vinegar, bringing it to a very gentle simmer over medium-low heat.
Crack the eggs into individual small ramekins, create a gentle vortex in the water, and carefully slide the eggs in to poach for 3 minutes.
While the eggs poach, lightly sear the Canadian bacon slices in a dry skillet until the edges are golden and toast the English muffin half.
Place the seared bacon onto the toasted muffin, top with a drained poached egg, and generously drizzle with the warm hollandaise.
Finish the dish with a sprinkle of sea salt, black pepper, and fresh chopped chives before serving immediately.