Preheat oven to 375 degrees F.
Spray 9x13" baking dish with cooking spray.
Place croutons on bottom of dish.
Top with bell pepper, green onions, cheese, and bacon.
In large bowl, mix together eggs, milk, mustard, salt, and pepper.
Pour over croutons and toppings.
Bake in preheated oven until eggs are set, about one hour.
Let sit for 5 minutes then serve warm. Enjoy!