The better the bread, the better the garlic bread. This is one of those dishes you really need to portion control in advance of making it because it's just that tempting to overeat. I usually use a half of a baguette sliced lengthwise for four people.
Preheat oven broiler to high. In a small bowl, whip together cream cheese and garlic. Spread evenly over cut surface of bread. Sprinkle Parmesan cheese evenly over bread. Put on a cookie sheet, place under broiler and cook until golden and bubbly, about 1 to 2 minutes. Serve immediately.