Preheat oven to 375* F.
Slice the loaf at 1 inch intervals, without cutting all the way through.
Rub slices and top of loaf with cut sides of garlic halves. Then mince the garlic.
Combine butter, garlic, parsley and Parmesan cheese in a small bowl.
Spread butter mixture between bread slices and on top of loaf
Wrap bread in foil, leaving top partially uncovered. Bake until heated through, about 15 minutes.