Preheat the oven to 350℉ & grease & parchment line your cake pans
Combine the softened vegan butter, oil & sugar in the bowl of your electric mixer with the paddle attachment & cream on high speed for approximately 5 minutes until light and fluffy, be sure to scrape the bottom & sides of the bowl from time to time.
Combine the plant milk with the vinegar & the extracts
Combine the aquafaba with the cornstarch & whisk together so there are no lumps
Once the butter mixture is creamed, slowly add the aquafaba/cornstarch to it until it is all incorporated then whip on high speed for 30 seconds to emulsify, the mixture will get very silky, fluffy and smooth
Sift the flour with the salt, baking soda & baking powder & then add 1/3 of it to the creamed mixture, blend just until combined then add half of the milk mixture
Add another 1/3 of the dry ingredients & then the remaining liquid & the last of the remaining dry ingredients. Be sure to scrape the sides & bottom of the bowl and whip it on high for 10 seconds to blend well.
Divide the batter amongst your prepared cake pans & bake immediately in the preheated oven that has been set to 350°F but once the cakes are loaded into the oven, turn the oven temperature down to 325°F & bake for a total of 25-30 minutes or when a toothpick inserted into the center comes out clean.
Build the cooled cakes with your choice of filling & icing