I have seen frozen garlic bread at the grocery store, but I don't understand why people would buy it. Making bread takes time, but even buying a loaf of bread and making it into garlic bread has got to taste so much better than frozen. This is super easy.
Sorry for the approximations in amounts. You really can't go wrong and it just depends on how much bread you are preparing (well, you might put in too much garlic and no one will want to talk to you for the rest of the night).
Baguette recipe (make the loaf as large or as small as you want)
2 - 4 Tbsp. salted butter (or use unsalted and add salt, to taste)
1 - 2 cloves minced garlic
1 - 2 Tbsp. chopped fresh parsley
Melt butter in a saucepan. Add garlic and remove from heat. Slice bread in half crosswise. Brush garlic butter on bread and sprinkle with parsley. Bake at 350 for 10 minutes. Turn on broiler, move bread to second highest rack level. Broil - watch carefully, as this doesn't take long - until bread is golden brown.