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 egg yolk, Greek yogurt, lemon juice, sea salt, and black pepper until smooth.
Place the bowl over a small pot of simmering water (double boiler method), whisking constantly while slowly drizzling in the melted ghee until the sauce is thickened and warm.
Split the English muffin and toast both halves until golden brown.
In a small skillet, lightly sear the Canadian bacon over medium heat for 1-2 minutes per side until heated through.
Crack the two large eggs into individual small ramekins. Use a spoon to create a gentle whirlpool in the simmering water and carefully drop each egg into the center.
Poach the eggs for 3 to 4 minutes until the whites are set but the yolks remain soft.
Place the toasted English muffin halves on a plate, top each with two slices of Canadian bacon and one poached egg.
Generously spoon the warm hollandaise sauce over the eggs and garnish with freshly chopped chives.