Enjoy a cool sweet treat by the fire after dinner. This toasted marshmallow milkshake is perfect to serve at a burger bash.
Heat broiler. Line a baking sheet with foil, then grease with nonstick spray. Set aside a few marshmallows for garnish, and spread remaining marshmallows on tray. Broil marshmallows 1 to 2 minutes, until nicely darkened. Cool tray in freezer 5 minutes, until marshmallows are no longer warm.
Transfer to blender, add milk, and purée. Toast reserved marshmallows individually. Set aside. Add vanilla to blender along with ice cream and sour cream. Blend until smooth. Pour into chilled glasses. Garnish each with a dollop of cream and reserved marshmallows. Serve at once.