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Prepare the Frosting Butter: Add the slightly softened butter to the mixing bowl and whisk on high speed for about 2 minutes, scraping down the sides at least once. After mixing, the butter will be lighter in color, smooth, soft, and will form a ball inside the whisk.
Add the powdered sugar, vanilla extract, and a small pinch of salt to the butter, then whisk again on medium-high speed for 1-2 minutes more.
Add the sweetened condensed milk in three parts, mixing for 1 minute on high speed before adding the next portion. Scrape the bowl down a few times during this process.
Once all the milk has been added, mix on high speed for one minute. If your buttercream looks runny, greasy, curdled, or broken at any time during this process, turn up the speed or mix for longer until it comes together.
Switch to the paddle attachment and mix on low speed for at least a few minutes to smooth the frosting. Give the frosting a taste and adjust for vanilla and salt, if needed.