Cook your bacon, if using. Toast your english muffins, and get your ham product and avocado ready for assembly.
In a medium pot, add water about half way full (full enough that the eggs will submerge when poaching). Bring to a boil over high heat, then reduce to a simmer.
Take a large wooden or metal spoon and stir the water to create a vortex. As the water continues to swirl, carefully crack in up to 4 eggs towards the center of the vortex. Use your spoon to gently encourage the eggs to keep swirling. Increase or reduce the heat so that the water is gently simmering.
Let simmer for 3-4 minutes or until whites are cooked and yolks are runny. Remove and transfer to a kitchen towel or paper towel to drain off the water.
Add butter to a small saucepan and melt over low heat. You want the butter to be very warm/hot when you pour it into the blender.
Add egg yolks, lemon, and mustard to a high speed blender and blend until smooth. With the motor running, slowly pour in the hot butter and then the fresh herbs (if using) and salt. Blend on high until smooth and emulsified.
Place a few slices of avocado on each muffin half, then top with prosciutto (try to make it nice and flat so the egg has a flat bed to sit on), poached eggs, and herby hollandaise sauce. Garnish with black pepper and devour!