Step 1

Ensure the butter is completely at room temperature before starting.

Step 2

Place the butter in a stand mixer with the whisk attachment. Whip on high speed for 5 minutes, occasionally scraping down the sides of the bowl.

Step 3

Reduce the mixer speed to medium. Add 1/3 of the condensed milk, whipping until fully blended. Repeat this step until all the condensed milk is incorporated.

Step 4

Add vanilla and salt, then whip on high speed for 1 minute to finish.