In a small bowl, cream the butter. Add the Parmesan cheese, oregano, garlic and salt to taste. Mix well.
Preheat oven to 355 degrees F. Spread a thick layer of butter mixture on top of each slice. Arrange the bread slices in a baking tray.
Bake in the oven until they are golden, about 8-10 minutes.
Serve the garlic breads as a side dish or as an appetizer.