In a mixing bowl, combine the heavy cream, sugar, and rum extract. Sift in the powdered sugar. Use a spatula to combine everything.
Once all the wet and dry ingredients are combined, use a hand mixer to whip the cream. Continue whipping until soft peaks form, for about 3-4 minutes. Stop mixing as soon as it reaches soft peaks, as it can quickly become lumpy.
Chill the whipped cream until ready to use or place in a piping bag and use immediately.
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