Customers can order the Peppermint Brownie Bark Shake as well as the Pretzel Bacon SONIC Smasher on the SONIC app.
Southern Living on MSN
SONIC's First Holiday Drink Of The Season Pulls On Our Nostalgic Heartstrings
The Southern fast-food chain is also launching a new smashburger and revamping their budget-friendly $1.99 menu.
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