Roast the garlic

• Preheat the oven.
• Place the garlic heads cut side up on a baking tray, drizzle with olive oil and wrap in foil.
• Roast until the cloves are soft and golden.

Make the roasted garlic butter

• Squeeze the roasted garlic cloves out of their skins into a bowl.
• Mash with the softened butter, parsley, salt and pepper until smooth.

Assemble the bread

• Spread the roasted garlic butter generously over the bread halves.
• Top with the mozzarella and parmesan.

Bake until cheesy

• Bake until the cheese is melted and bubbling and the edges are crisp.
• Slice and serve warm.