Preheat oven to 400°F (200°C).

Finely chop the onion and celery.

In a bowl, combine softened butter, chopped onion, chopped celery, oregano, garlic powder, salt, and pepper.

Wash and dry the baking potatoes.

Cut several slits into each potato, making sure not to cut all the way through.

Spoon the butter and herb mixture into the slits of each potato.

Wrap each potato in foil.

Bake in the preheated oven for approximately 60 minutes, or until the potato is tender.

Remove from oven and let cool slightly before serving.