Homemade garlic bread recipe with an easy three-ingredient garlic spread. Crushed cloves of roasted garlic give the bread a slightly caramelized flavor.
Preheat the Oven - Set the oven rack to center position. Preheat to 400ºF (204ºC).
Prepare the Garlic - Peel the white papery skin off the garlic, making sure to keep the cloves intact with the root. Cut about ¼-inch off the top. If any cloves on the sides don't get cut, then carefully use a knife to slice off the top.
Roast the Garlic - Place garlic in the center of a piece of foil large enough to completely wrap. Drizzle olive oil over and tightly wrap. Roast until fragrant, lightly browned, and tender when pierced with a fork, 40 to 60 minutes. Check at 40 minutes, then every 10 minutes for doneness. When roasted garlic has cooled slightly, transfer them to a small bowl. Lower oven temperature to 325ºF (163ºC).
Mix the Garlic Spread - Combine roasted garlic cloves, mayonnaise, and 2 tablespoons of sliced green onions in a small bowl. Use a fork to mash and mix the ingredients into a smooth spread.
Prepare the Bread - Slice the bread loaf in half lengthwise. Place on a baking tray topped with a wire rack. Spread equal amounts of softened butter over the slices. Spread equal amounts of the garlic mixture over the butter. Sprinkle additional green onions on top.
Bake - Bake until crispy and when the topping is set and lightly golden, about 12 to 15 minutes. For extra crunch, broil for 1 to 2 minutes. Slice and serve hot.