Sonic Drive-In1320 Round Rock AveOpen now$1.99delivery feeLimited TimeNational Breakfast EntreesLocal Breakfast FavoritesNational ChickenNational BurgersHot DogsNational SandwichesCombosWacky Pack Kids MealsSidesSnacksSonic Rechargers with Red BullSlushesReal Fruit SlushesLemonades & LimeadesSoft DrinksIced TeaCoffeeOther DrinksFrozen Zone - Sonic BlastsFrozen Zone - Classic ShakesFrozen Zone - Master ShakesFrozen Zone - SundaesLocal Breakfast FavoritesBacon, Egg and Cheese Brioche Breakfast SandwichEgg, cheese and bacon between a warm, brioche bun.$6.88Sausage, Egg and Cheese Brioche Breakfast SandwichEgg, cheese and sausage between a warm, brioche bun.$5.00