Preheat oven to 400 degrees.
Slice the top off the head of garlic and drizzle with olive oil. Wrap tightly in aluminum foil and roast for one hour or until garlic is soft. Remove from oven and cool.
Squeeze 4 roasted garlic cloves from the skin and place in the bowl of a food processor. Add the softened butter, blue cheese and parsley and pulse until smooth. Season to taste with salt and pepper.
To serve on bread or toss with pasta:
Place whipped butter in airtight container and refrigerate until ready to use. Let the butter soften before serving.
To use for meat topping:
Place butter on piece of plastic wrap and form into log. Twist ends of plastic wrap like a candy wrapper to get round log. Wrap in foil and freeze until set.
Slice into ¼-inch discs and serve over steak or chicken.