Slice the bagel in half and toast lightly using a toaster, skillet, or air fryer.
Slice the avocado and spread it evenly on the bottom half of the bagel.
Heat olive oil in a small skillet over medium heat.
Crack the egg into the pan, keeping the yolk intact.
Season with salt, black pepper, and a pinch of za’atar.
Cover the pan and cook until the egg white is set but the yolk remains runny.
Place the cooked egg on top of the avocado.
Add the cheese slices so they gently melt over the warm egg.
Top with pickled onions and drizzle your favorite sauce.
Close the bagel, slice, and serve immediately. This breakfast bagel is best enjoyed warm.