Preheat the oven to 400°F. Cut the top of the garlic off horizontally.
Place the garlic head on a large piece of tin foil. Drizzle with a tablespoon of the olive oil, season with salt and pepper. Wrap up the head of garlic and roast it for 30-45 minutes in the oven, until it's really soft.
Trim the green onions to remove root end and any yellowing pieces. Cut into 4” sections. Place them on a baking sheet. Drizzle on high-smoke point oil and sprinkle with salt and pepper.
Put them in the oven, on the top rack, on broil. Broil until they are mostly charred.
Remove the scallions from the oven and cool; then roughly chop.
When the garlic is done, squeeze the pulp out of the bulb into a bowl. Mash it with a fork.
Add the chopped scallions, cream cheese, sour cream and some salt and pepper to the bowl; mix well.
Season to taste.
Serve on bread slices or with chips.