Whisk the egg yolk, Greek yogurt, lemon juice, and Dijon mustard in a small heat-proof glass bowl.
Place the bowl over a small saucepan of simmering water, ensuring the bottom of the bowl does not touch the water.
Slowly whisk in the melted ghee, stirring constantly until the sauce thickens into a velvety consistency.
Season the hollandaise with sea salt, black pepper, and cayenne pepper, then remove from heat and keep warm.
Fill a medium saucepan with water and white vinegar, bringing it to a very gentle simmer.
Crack each egg into a small ramekin and gently slide them into the simmering water, poaching for 3 minutes until whites are set.
While eggs poach, toast the English muffin halves and lightly sear the Canadian bacon in a dry skillet over medium heat.
Place two slices of bacon on each muffin half, top with a poached egg, and drizzle generously with the zesty hollandaise.
Garnish with freshly chopped chives and serve immediately.