Gather all of your ingredients first. Having everything ready makes the process smooth and mess-free.
Slice the strawberries thin and dice them up—make sure you measure out 1 ½ cups.
Toss the strawberries into a blender and puree until completely smooth. Scrape the sides down with a spatula if needed to avoid any chunks.If the strawberries seem really juicy, pour the puree into a saucepan and simmer over low heat for 8–10 minutes. Let it cool completely before using.
Add the room temperature butter to your mixer bowl and beat until it's super smooth and creamy.
Mix in the powdered sugar and vanilla extract. Let the mixer run until everything’s fully combined.
Slowly pour in the strawberry puree, a little at a time, mixing in between each addition.Stop and check the texture often—if it’s getting thin, pause and add a bit more powdered sugar.You may not need all the puree, so don’t dump it all in at once.
Crank the mixer to high and whip for 8–10 minutes until you get those lovely stiff peaks.
Transfer the finished frosting into a piping bag, seal it with a tie, and decorate as you please!