Based on the reference provided, you can double the volume of store-bought frosting with a simple tip! The referenced video demonstrates this technique. Here's how:
Essentially, the provided reference implies that you can increase the volume of store-bought icing (and therefore make more) by whipping it. This will introduce air and increase the overall quantity of usable icing.
Since there's limited detail, I'll offer a generalized approach that should work:
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Start with your existing frosting. Remove the desired amount of store-bought frosting from its container and place it into a mixing bowl.
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Whip the frosting. Using an electric mixer (handheld or stand mixer), whip the frosting on medium-high speed. The video implies this will incorporate air and double the volume. The precise amount of time to whip it is not given, but a reasonable estimate would be 2-5 minutes, or until you achieve the desired increase in volume and a light, fluffy texture. Watch carefully to avoid over-whipping.
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Use immediately. The whipped frosting will be lighter and airier, and should be used promptly for best results.
