Soften 1 cup of butter on counter.
Place in bowl and beat with electric mixer until smooth.
Beat in 3/4 cup of canola oil. Beat in 1/2 of the oil at a time, making sure the butter is very smooth. (it will be very thin)
Pour into plastic container and store in fridge for up to 2 weeks.
Take out a few minutes before using to let it soften for easier spreading.