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In a large bowl, use an electric mixer on medium-high speed to beat the butter until it's creamy, about 2 minutes. Gradually add the sugar, beating until the mixture is light and fluffy, which should take about 3 minutes. Scrape down the bowl once or twice as you go.
Beat in the vanilla extract, then add the eggs one at a time, mixing well after each addition.
Add 2 cups of confectioners' sugar and beat on low speed. Continue adding the remaining confectioners' sugar a little at a time until the frosting is thick enough to cling to the beater without dripping when lifted. If it becomes too stiff, add in a little more sour cream, a teaspoon at a time.
Once all the sugar is incorporated, beat for an additional 3 to 4 minutes on low speed to ensure a smooth, light, and fluffy frosting.
Per serving
Allergen information is derived automatically from the ingredient list and is a guide, not a guarantee. Always check the packaging of the products you cook with.
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