Preheat your oven to 375°F (190°C).
Cut the bread in half lengthwise and lay both pieces cut-side up on a baking sheet.
Mix the butter, garlic, salt, pepper, and oregano in a bowl. Slather it all over the bread halves. Don't be shy.
Sprinkle the mozzarella and Parmesan cheeses evenly across both halves.
Bake for 12-15 minutes, or until the cheese is melted, bubbly, and a little browned in spots.
Let it cool for a minute or two (good luck with that), then slice and serve. Sprinkle parsley on top if you're feeling classy.