Add the cream cheese, margarine and vanilla extract to a large bowl. Use an electric mixer to whisk it until smooth and well combined.

Add in the icing sugar, mixing it in a little bit at a time with a wooden spoon. Once it's all mixed in, whisk again with your electric mixer until thick and creamy.

If the frosting is too thick, add a splash of plant-based milk or water. If you want it to be thicker, refrigerate it for an hour or two, or add more icing sugar until you get the desired consistency.