Just in time for the cooler weather, this week marked the debut of milkshakes at Five Guys in Potomac Village. The $4.49 price includes unlimited mix-ins of malted milk, peanut butter, Double Stuf Oreos and a bunch of other goodies that will make you glad it’s finally sweatpants season (click here for the full list). And for those who prefer a healthier way to drink in some extra calories: Just across Falls Road, the Sprinkles ice cream shop is about to debut a new juice bar.