Article: Use a spatula to transfer the frosting from the container to a mixing bowl. Add 1 tablespoon (15 g) of powdered sugar to the bowl and mix it by hand or with an electric mixer. If you would like the frosting to be thicker, mix another tablespoon (7.5 g) of powdered sugar into the frosting. Put the frosting in a mixing bowl using a spoon or spatula. Add teaspoon (2.5 mL) of milk to the bowl. Mix it with an electric mixer or by hand. If the frosting is still too thick, mix another teaspoon (2.5 mL) of milk into it. You can substitute milk for water, if desired. Transfer the frosting to a large mixing bowl. Whip the frosting using a whisk or an electric mixer until it doubles in volume. Don't continue whipping after the volume has doubled, or you risk creating lumps in the frosting.
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Add 1 Tbsp of powdered sugar to thicken the frosting. Thin the frosting using tsp of milk. Whip the frosting to make it light and fluffy.