Preheat oven to 350°F. Sliced a round of sourdough bread lengthwise and then crosswise to about ¼ inch from the bottom of the round.
Place butter in a microwave safe bowl with oregano and garlic salt and cook for 30 seconds in the microwave. Stir and cook for another 30 seconds. Take out of microwave and drizzle in 1 tablespoon increments into each side of cuts of bread, reserving 1 tablespoon butter.
Combine the Smoked Mozzarella and Parmesan together and stuff slits of bread with cheese. Drizzle top with remaining tablespoon of butter. Wrap bread round in foil and bake for 30 minutes then open foil and bake for another 5 minutes or until cheese is melted. Remove from oven and serve immediately with warmed marinara sauce for dipping.