For the roasted garlic - Preheat the oven to 400 degrees. Cut ΒΌ of an inch off the top of a whole head of garlic. Wrap in foil and slather with 1-2 tablespoons olive oil. Roast for 35-40 minutes until fragrant and soft. Once cooled, squeeze out cloves. Set aside.
In a food processor or by hand, blend the mayo and cream cheese with the scallions and the roasted garlic until well mixed.
Fold in the rest of the ingredients until combined, tasting as you go. Add more salt or a splash more of tabasco if needed and garnish with chopped chives.