Allow your vegan butter to sit out at room temperature for an hour or so or unwrap and microwave until SLIGHTLY softened (NOT melted).
Combine one cup of crisco and 2 cups of butter in the bowl of your mixture and turn on.
Allow the crisco and butter mixture to cream for a minute or so until mixed together well and no longer clumpy.
Next, pour in 2 teaspoons of vanilla extract and 3 Tablespoons of oat milk and continue to whip for an additional minute.
Turn off your mixture and add in half the powdered sugar. I would suggest starting low and slow.Slowly turn up your speed until combined and again, turn the mixture off. Add in the rest of the powdered sugar and repeat until fluffy and all ingredients are combined, scraping the bowl as needed.
Depending on your location and humidity levels you might need to add in an additional tablespoon of oat milk to soften.
Use to decorate cakes, pipe beautiful designs, or fill yummy cookie sandwiches. Enjoy!