I recommend making the hollandaise sauce first. Keep it warm by nestling a bowl or pitcher in a larger bowl of very hot water while you prepare the rest of the benedict.
Heat a skillet over medium heat. Add the ham, and fry, turning once, until browned on both sides. Remove to a plate and cover to keep warm.
Start poaching the eggs. You can use the stove top method if you're cooking for a crowd, or the microwave method, if you're cooking for 2-3.
To microwave, find a mug or glass bowl with rounded sides. Fill with 1/2 cup of water. Gently crack an egg into the bowl. If the egg isn't submerged in water, add a bit more. Place in the microwave, and microwave for 45-55 seconds, or until egg white is set, but center is still soft. Remove with a slotted spoon and drain on a paper towel before serving.
While the eggs are poaching, toast the bagels.
To serve, stack each bagel half with one slice of ham, a few avocado slices, and one poached egg. Drizzle with hollandaise sauce. Sprinkle with Everything Bagel Seasoning and chives. Serve immediately.