Preheat your oven to 190°C (375°F). Grease a 9x13 inch baking dish.
In a large bowl, whisk together the eggs, milk, salt, and pepper.
Add the cubed everything bagels, cream cheese cubes, shredded cheddar cheese, crumbled bacon, and chopped chives to the egg mixture. Stir gently to combine.
Pour the mixture into the prepared baking dish, spreading it evenly.
Bake for 40-50 minutes, or until the casserole is set and golden brown on top. Let it rest for 5-10 minutes before serving.
Notes
This casserole is delicious served with a side of fresh fruit or your favorite hot sauce.