Preheat oven to 375
Cut the heel off the head of garlic, leaving all the cloves together in one bunch.
Place the cut head in the center of a square of aluminum foil and drizzle with the olive oil.
Bring the corners of the foil together and pinch together. Place the garlic in the oven for 60 minutes.
Slice the bread.
Let the garlic cool slightly, then gently squeeze the cloves out.
Chop the cloves coarsely. They will be quite soft, and may simply mash into a paste. No worries.
Using a fork, mix the garlic into the butter along with a pinch of salt (to taste)
Spread the garlic butter liberally onto each slice of bread. Place the slices on a baking sheet.
Place the baking sheet in an oven set to broil on high for 3-5 minutes, or until desired toastiness is reached. Eat it while it's hot, man!