1. Preheat oven to 350 degrees F. Slice the top off the head of garlic to expose the clove tops. Spray the garlic generously with cooking spray. Wrap in aluminum foil and roast until cloves are soft (25-30 minutes).
2. Let garlic cool until safe to handle (5 minutes). Remove the cloves from the skin by pushing up from the root of the head of garlic with your thumb.
3. In a blender or food processor, add the beans, roasted garlic cloves, olive oil, and lemon juice. Blend until smooth.