I'm going to make this weight gain milkshake recipe i have found online for my grandson https://cream-chargers.uk/blog/high-calorie-weight-gain-milkshake-recipe/
If you want to make either a plain white or lemon cake without any dairy, start with the base ingredients. You'll need all-purpose flour, baking powder, sugar of your choice (white or raw), salt and vegetable oil. Add in some vegan butter substitute such as Earth Balance to enhance the flavour...