2 teaspoons finely chopped garlic
1/2 stick (1/4 cup) unsalted butter, softened
1 tablespoon extra-virgin olive oil
2 tablespoons finely chopped fresh flat-leaf parsley
1 (15- by 3 1/2-inch) loaf Italian bread
Preheat oven to 350°F.
Mince and mash garlic to a paste with a rounded 1/4 teaspoon salt using a heavy knife. Stir together butter, oil, and garlic paste in a bowl until smooth, then stir in parsley.
Without cutting completely through bottom, cut bread diagonally into 1-inch-thick slices with a serrated knife, then spread garlic butter between slices.
Wrap loaf in foil and bake in middle of oven 15 minutes. Open foil and bake 5 minutes more.