Step 1Soak bread in water.
Step 2Cook chicken livers in butter over medium heat, mashing livers while cooking. Add salt, onion, parsley, celery leaves and mushrooms and continue cooking until chicken livers are cooked and no longer pink and onion is soft. Add garlic powder, oregano and basil.
Step 3Squeeze water from wet bread and place bread in large bowl. Add egg and sage and mix well. Add cooked liver mixture.
Step 4Turn into greased 13x9-inch baking dish, cover tightly with foil, and bake at 375 degrees 30 minutes. Remove foil and bake another 15 minutes.