Mix 1/2 cup of softened plant butter with 1 3/4 cups of powdered sugar for 2 minutes until well combined.
Turn on the mixer to high and slowly pour in 1/2 cup of aquafaba and 2 teaspoons of vanilla.
Beat on high for at least 5 minutes, stopping to scrape the edges occasionally. The whipped cream may appear to separate at first but will come together again when you keep mixing.
After it has whipped for at least 5 minutes after adding all the aquafaba, use it like whipped cream on your favorite desserts or instead of traditional frosting on cakes and cupcakes.
Notes
You will have the best results if your aquafaba is thick. It should be the consistency of syrup. Many brands of beans have thick aquafaba out of the can, but if your aquafaba is watery, simply put it into a saucepan and simmer it for about 10 minutes. Turn off the heat and let it cool to room temperature. This will cook off some of the water and give it more whipping strength.
Your whipped cream frosting will fall apart a little when you add the aquafaba, this is normal, just keep whipping and it will come together again.