Do ahead: In a blender, pure entire can of peaches. Transfer peach pure to a separate bowl/pitcher.
Keep chilled. Rinse blender bowl and return to base. (Makes enough to prepare the recipe 3 times, for 6 servings.)
To make 2 cocktail drinks: Juice two limes and pour lime juice into blender bowl. Add whiskey, 5 ounces peach pure and sugar. Fill a serving glass with ice, then add ice to blender and repeat, adding another glass of ice. Blend until smooth. Pour into two 14-ounce cocktail glasses. Garnish with whipped cream, if desired.
Nutritional Information Per Serving: Calories per drink: 220 (based on 80-proof whiskey)**
*Note: One, 15-ounce can of peaches in heavy syrup makes 6 drinks.
**Note: Higher-proof whiskey contributes more calories.
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