Fill a medium saucepan with 4 inches of water and add the white vinegar, bringing it to a very gentle simmer over medium-low heat.
Create a double boiler by placing a heat-proof glass bowl over the simmering water, ensuring the bottom of the bowl does not touch the water.
In the bowl, whisk together the single egg yolk, Greek yogurt, lemon juice, sea salt, and cayenne pepper until smooth and combined.
Slowly drizzle the melted ghee into the yogurt mixture while whisking constantly until the sauce thickens into a velvety consistency, then remove from heat and cover to keep warm.
Heat a small non-stick skillet over medium heat and sear the Canadian bacon slices for 1-2 minutes per side until lightly browned and warmed through.
Crack the remaining two eggs into individual small ramekins, stir the simmering water to create a gentle vortex, and carefully drop the eggs into the water to poach for 3 minutes.
Toast the English muffin half until golden, place the Canadian bacon on top, add the poached eggs, and finish with a generous spoonful of hollandaise and a sprinkle of fresh chives.