This make-ahead casserole is loaded with bagels, smoked salmon, cream cheese and all your other favorite bagel toppings, and is perfect to serve a crowd!
Preheat the oven to 400 degrees Fahrenheit. Pour melted butter into a 15-quart baking dish and turn to coat dish. Set aside.
In a large mixing bowl, combine all ingredients (except the 1 cup of Parmesan and 1 tablespoon of chives for topping.)
Pour mixture into prepared casserole dish and sprinkle 1 cup grated Parmesan over top.
Bake in 400 degree oven for 30-45 minutes, or until eggs are fairly set (they may continue to cook a bit after removing the casserole from the oven so don’t fret if they’re still a tiny bit runny.)
Let cool slightly and sprinkle on additional tablespoon of chopped fresh chives before serving.