Cut the loaf lengthwise with a sharp knife. Make even pieces so the topping spreads well and bakes evenly without burning.

Add butter to a small pan on low heat. Let it melt slowly so it does not brown and keeps a smooth creamy texture.

Stir in minced garlic and cook lightly. Do not burn it because burnt garlic tastes bitter and will change the whole flavor.

Add parsley, salt, pepper and chili flakes. Stir well so every part of the butter mix carries flavor to the bread surface.

Brush the garlic butter over the sliced bread. Cover corners well so each bite feels rich, moist, and full of flavor.

Sprinkle mozzarella and Parmesan over the bread. Spread evenly so each slice gets stretchy cheese and melts nicely during baking.

Place bread on baking sheet and bake. Keep oven at 375°F until cheese melts and edges turn golden crisp and fragrant.

Remove from oven and add lemon zest. Rest for two minutes, slice pieces and serve warm while cheese is still soft.