The key to fluffy vanilla buttercream frosting is a lengthy whip at the end - a full 5 minutes. This simple trick makes a light and airy frosting that spreads and pipes beautifully! This buttercream frosting comes together quickly, isn't overly sweet and packs a vanilla punch! It's perfect for frosting cakes and cupcakes and for filling sandwich cookies.
Add butter to bowl of stand mixer fitted with the paddle attachment. Whip butter until pale and smooth. You'll hear it slapping the sides of the bowl.
With the mixer on low speed, add half of powdered sugar and mix until combined. Repeat with second half. Scrape down sides of bowl and paddle.
Add vanilla and salt and mix until combined. Increase speed to medium-high and whip 5 minutes, stopping half way through to scrape sides of bowl and paddle.
Spread or pipe frosting as desired.
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Notes
If you use unsalted butter, increase salt to 1/4 teaspoon.