I've seen garlic bread like this in restaurants before and loved it, so I had to make my own. This goes great with any kind of Italian dish, especially ones with lots of sauce so you can use the sticks to scoop some up.
Cut the bun in half, then cut each side in half again, crosswise. Lay cut-side-up and score the bread lengthwise two times, forming 3 attached strips. Be sure not to cut all the way to the bottom, but close enough so the bread can easily be pulled apart. (see pictures for visuals).
Put the garlic and olive oil in a small dish and heat in the microwave for about 30 seconds or until fragrant. Use a spoon to evenly distribute the olive oil and garlic over each slice of bread. Sprinkle each piece with dried oregano. Place on a baking sheet and put in the oven for 5-10 minutes, until the bread starts to dry. Once most of the bread is dry, turn on the broiler to lightly brown the top. Remove and serve!