Preheat the oven: Set it to 425°F (220°C).
Line a sheet pan with foil for easy cleanup.
Prep the bread: Slice the loaf in half lengthwise. If the loaf is very thick, you can trim a little from the interior to create more surface area for the spread.
Make the garlic butter: In a bowl, mix softened butter, minced garlic, parsley, salt, pepper, red pepper flakes, oregano, and lemon zest. Add a drizzle of olive oil if you want a silkier spread.
Toast the bread base: Place bread cut-side up on the sheet pan.
Lightly brush with olive oil (optional) and toast for 4–5 minutes. This step helps prevent sogginess.
Spread generously: Remove from the oven and spread the garlic butter evenly to the edges. Don’t skimp—edge-to-edge coverage gives you maximum flavor.
Add the cheese: Sprinkle mozzarella evenly, then dust with Parmesan.
Press lightly so it adheres.
Bake until bubbly: Return to the oven for 8–12 minutes, until the cheese is melted and the edges are golden.
Broil for color (optional): Switch to broil for 1–2 minutes to get golden spots on top. Watch closely—cheese can burn fast.
Rest and slice: Let the bread sit for 2–3 minutes so the cheese sets slightly. Slice into thick strips or squares.
Finish smart: Sprinkle a little extra parsley or a tiny pinch of salt if needed.
Serve hot.