Preheat your oven: Start by preheating your oven to 375°F (190°C).
Prepare the garlic butter: In a medium bowl, combine 1/2 cup softened unsalted butter, 4 minced garlic cloves, 1/2 teaspoon salt, and a pinch of black pepper. Mix until fully combined and set aside.
Slice the bread: Take your 1 loaf of French or Italian bread and slice it in half horizontally. Place the bread cut-side up on a baking sheet.
Spread the garlic butter: Generously spread the garlic butter mixture evenly over the cut surfaces of the bread. Make sure to coat it completely for maximum flavor.
Add the cheese: Sprinkle 1/2 cup grated Parmesan cheese evenly over the buttered bread, followed by 1 cup shredded mozzarella cheese for that irresistible gooey texture.
Bake: Place the baking sheet in the preheated oven and bake for about 10-15 minutes or until the cheese is melted and bubbly.
Broil (optional): For a golden top, switch your oven to broil and cook for an additional 2-3 minutes, keeping a close eye to avoid burning.
Garnish: Remove the cheesy garlic bread from the oven and sprinkle with 1 tablespoon chopped fresh parsley for a touch of freshness.
Serve: Allow to cool for a moment, then slice into pieces and serve warm. Enjoy the gooey goodness!