Herbed Garlic Bread

large cloves garlic

unsalted butter, at room temperature

Salt

chopped parsley, plus 1/2 cup parsley leaves

chopped chives, plus 1/2 cup chives cut into 1-inch pieces

chopped basil, plus 20 basil leaves

Heaping 1/3 cup finely grated Parmesan (about ¾ ounce)

Freshly ground black pepper

loaf rustic country bread

Extra-virgin olive oil