Place aquafaba in a cocktail shaker; shake vigorously 20 to 30 seconds to aerate.
Add whiskey, lemon juice, and simple syrup; fill shaker with ice. Shake vigorously for 1 minute.
Place 1 large square ice cube into each of 2 cocktail glasses; strain whiskey sour evenly between the 2 glasses. Garnish with cherries, if desired.
*This recipe does not comply with Cooking Light nutrition standards.
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