Preheat the oven to 400 degrees F. Slice French bread in half lengthwise (or cut into normal slices). Place the French bread slices onto a baking sheet, cut side up. In a small bowl combine butter and garlic and mix together with a fork. Spread the garlic butter evenly onto the cut sides of the French bread. Spread a layer of pizza sauce over the garlic butter. Top with cheese and pepperoni slices.
Place into the oven and bake for about 15 minutes or until the cheese has melted and the bread is toasted. Remove from the oven and slice into pieces.