Most garlic bread that I encounter here in the U.S. is loaded with lots of butter and often granulated garlic powder. According to my Italian grandmother, that stuff is not authentic.
Here is her version of garlic bread. It's simpler, much healthier, and very tasty.
4 slices hearty Italian bread, cut in half if very large
1 or 2 tablespoons extra virgin olive oil, as needed
2 large cloves garlic, halved
Preheat broiler. Place bread slices in single layer on baking sheet. Toast under broiler until golden on one side.
Turn the bread slices over, and brush the untoasted sides lightly with the olive oil.
Broil until the oiled side of the bread is crisp and golden. The inside of the bread should still be somewhat tender.
Remove from broiler, and then rub the oiled sides of the bread with the cut sides of the garlic cloves. Use 1/2 garlic clove for each bread slice.
Discard the garlic cloves (or use as a garnish), and serve the toast immediately.
-- 4 servings