I know garlic bread is near impossible to make non-vegetarian, but this is one of the easiest recipes ever.
The most important thing is that you need good bread. 
A big loaf of Italian bread from your local supermarket will be great, but you can do this with hoagie rolls or something along those lines.
Cut the loaf lengthwise, but make sure to keep it in one piece so you can close it back up.
Butter both sides of the loaf with your favorite butter, margarine or vegan butter (Smart Balance light is vegan and works well for this).
Sprinkle generously with garlic powder.  Don't use garlic salt, you'll regret it.  I learned that the hard way a long time ago.
A little bit of Parmesan cheese adds a nice bit of flavor to this, but it's good without it too. 
Wrap it in foil and bake at 375 for ten or fifteen minutes. 
Slice it while it is still hot.  Serve and enjoy.