Saute the onion and celery in the friendly fat for about 5-7 minutes. Add a few pinches of salt to bring out their juices and sweeten.
Add the garlic and seasonings and cook for a minute.
Add the broth and bring to a simmer. Taste for seasoning/saltiness and add as needed. It should taste like a salty herbed soup.
Put the bread, egg, and broth mixture in a large mixing bowl and combine well.
Pour the bread mixture in the buttered 9x13 baking dish.
Bake COVERED for 30 minutes at 375 degrees.
Uncover the baking dish and bake another 25-30 minutes.