Fill a medium saucepan with water and add the white vinegar; bring to a very gentle simmer over medium-low heat.
In a small heat-proof bowl, whisk together the Greek yogurt, one egg yolk, lemon juice, sea salt, and melted ghee.
Place the bowl over a small pot of simmering water (double boiler method) and whisk constantly for 3-5 minutes until the sauce is thickened and warm.
Split and toast the English muffin until the edges are golden and crisp.
In a separate non-stick skillet, sear the Canadian bacon slices over medium heat for about 1 minute per side until warmed through.
Gently crack the two large eggs into the simmering vinegar water and poach for 3 minutes until the whites are opaque but the yolks remain soft.
Place the toasted English muffin halves on a plate and top each with two slices of Canadian bacon.
Use a slotted spoon to carefully lift the poached eggs from the water, drain well, and place one on each muffin half.
Generously spoon the warm yogurt hollandaise over the eggs and garnish with fresh black pepper and minced chives.