2 hours ahead remove butter from the fridge and leave at room temperature to soften or soften in the microwave. Preheat oven to 325 F.
Slice the garlic clove horizontally so that each clove is cut but the root ball can still hold it together. Coat with olive oil and season with salt. Wrap the garlic in foil and bake in oven for 20 minutes. Remove from the oven and mash the garlic cloves into a paste.
Stir the garlic paste into the compound butter until a even butter is formed. For smoother butter use a food processor to combine the butter and garlic.
Pour the compound butter onto a piece of plastic wrap. Roll the butter in the plastic to form a log. Place the plastic wrapped butter in the fridge and allow it to harden. Once the butter is hard. Remove it from the plastic and enjoy.