Fill a medium pot with water and add 1 teaspoon of white vinegar; bring to a gentle simmer over medium heat.
In a small heat-safe glass bowl, whisk together the single egg yolk, Greek yogurt, melted ghee, and lemon juice until the mixture is completely smooth.
Place the bowl over the simmering water pot to create a double boiler, whisking the yogurt mixture constantly for 2-3 minutes until it is warm and slightly thickened, then remove from heat.
Season the hollandaise sauce with sea salt and black pepper, covering it to keep warm while you prepare the rest of the meal.
In a small skillet over medium heat, lightly brown the Canadian bacon slices for about 1 minute per side until heated through.
Split the whole grain English muffin and toast the halves until they are golden brown and crisp.
Crack each of the two large eggs into individual small ramekins.
Use a spoon to create a gentle whirlpool in the simmering water and carefully slide the eggs in, poaching them for 3 minutes until the whites are set but the yolks remain runny.
Place two slices of Canadian bacon on each toasted muffin half, then use a slotted spoon to lift the poached eggs from the water and place them on top of the bacon.
Generously drizzle the warm Greek yogurt hollandaise over the eggs and garnish with finely chopped fresh chives.