Preheat and Prepare: First, preheat your oven to 180°C (160°C fan). Line a large baking tray with parchment paper. This will catch any cheese drips and make cleaning up much easier.

Slice the Bread: Slice your loaf of bread in half horizontally, creating two long, flat pieces. Place them cut-side up on the prepared baking tray.

Create the Garlic Butter: In a small bowl, combine the softened salted butter, minced fresh garlic, garlic powder, dried oregano, and a pinch of black pepper. Mash everything together with a fork until it's well combined and forms a smooth paste. What works best for me is to ensure the butter is truly at room temperature, making it effortless to mix.

Spread the Butter: Divide the garlic butter mixture evenly between the two halves of the bread. Use the back of a spoon or a knife to spread it all the way to the edges. Don't be shy here; a generous layer is what we want!

Toast Lightly (Optional but Recommended): For an extra-crisp base that doesn't go soggy, place the bread in the preheated oven for 5 minutes. This initial toast creates a slight barrier for the cheese.

Add the Cheeses: In a separate bowl, toss together the grated mozzarella and grated mature cheddar. Sprinkle this cheese mixture evenly over the garlic butter-covered bread.

Bake to Perfection: Place the baking tray back into the oven and bake for 10-12 minutes, or until the cheese is completely melted, bubbling, and just starting to turn golden brown in spots.

Garnish and Serve: Carefully remove the tray from the oven. Sprinkle the freshly chopped parsley over the hot cheese. Let it rest for a minute or two before slicing into generous portions and serving immediately while it's warm and gooey.