Preheat oven to 400 degrees. Cut tops off garlic heads to expose tops of cloves. Place garlic on a medium piece of heavy duty foil. Drizzle with olive oil and sprinkle with salt. Wrap garlic in foil, place in the oven. Bake 45 minutes or until garlic is very tender. Remove from oven. Cool completely.
Place softened cream cheese and goat cheese in a large bowl. Squeeze garlic into the bowl, add sliced green onions, mayo, hot sauce, oregano, onion and garlic powder. Beat cream cheese mixture until smooth. Stir in blue cheese.