Preheat the oven: Preheat oven to 350°F (177ºC). Line a baking sheet with foil or parchment.
Make the garlic butter: In a medium bowl, mix together the butter (1/2 cup), olive oil (1 tablespoon), garlic (1 tablespoon), salt (1/4 teaspoon), pepper (1/8 teaspoon), parsley (2 tablespoons), basil (2 tablespoons), rosemary (1/2 teaspoon), and Parmesan (1/2 cup) until evenly combined.Let the mixture sit for 5–10 minutes so the garlic flavor mellows and blends into the butter.
Prepare the bread: Slice the bread in half lengthwise and place cut side up on the baking sheet. Spread the butter mixture evenly over both halves, making sure to go all the way to the edges.
Bake (soft + infused phase): Bake for 10–12 minutes, until the butter is melted and the bread is heated through.
Broil (crisping phase): Switch the oven to broil and cook for 1–2 minutes, just until the edges are golden and slightly crisp. Watch closely to prevent burning.
ServeSlice and serve immediately while warm and crisp.
Notes
Use fresh garlic. It gives the boldest, best flavor.
Spread evenly edge-to-edge. This prevents dry spots and ensures flavor in every bite.
Broil at the end. This creates crispy, golden edges while keeping the center soft.
Watch closely while broiling. Garlic bread can go from perfect to burnt quickly.
Use the right bread. French or Italian bread gives the best texture balance.